KyouStudy: Language Learning

HungBok · Build 1.0.6

com.hungbok.benkyou
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Limited coverageScanned 2026-11-04 06:23 UTC

Review the recorded findings below. An overall grade is withheld where required checks lack coverage; a new scan may provide additional evidence.

Analysis limitations (1)
  • The amount of extracted text exceeded the analysis limit.

Backend checks: 2 unauthenticated read checks against backends referenced in this build — 2 refused access. Each check describes one request at the recorded scan time and does not establish the backend's current state.

Overview

Limited assessment

3 finding categories to review

KyouStudy: Language Learning (com.hungbok.benkyou) was scanned at version 1.0.6 on 2026-11-04 but is not graded, because the analysis did not complete enough of its checks for a score to mean anything. The checks that did run recorded 3 finding categories across 3 occurrences; because the analysis did not complete, the absence of anything more severe is not a result. 6 tracking SDKs are present in the package, which describes what ships, not what runs or what it sends. This is static analysis of a single build: it does not observe the app running and does not establish that any data is exposed.

Finding categories33 occurrences
High / critical0Category count
Tracking SDKs6Presence, not observed traffic
Assessment scoreNot gradedNot graded

Start with these findings

lowFirebase Storage bucket reference1 occurrence

Interpretation & review guidance

A Firebase Cloud Storage bucket reference (the default <project>.appspot.com). Storing user files here is normal — it's only an exposure if the Storage security rules allow public read/list, which live verification tests.

Remediation: Fix a publicly readable Firebase database →

Reference: CWE-200 · CWE-284 · MASVS-STORAGE-2 — what the control asks for, and other apps with the same finding.

Evidence
1 recorded occurrence in the analyzed APK. These are distinct stored findings, not a count of every source match.
Verification
Static detection; current reachability is not established.
Open in all findingsRequest a correction
lowGoogle API key (client-shipped; restriction unverified)1 occurrence

Interpretation & review guidance

Android apps are designed to ship Google API keys in the client; Google restricts them by app signing certificate + enabled API. This is only a problem if the key is left unrestricted — presence alone is expected, not an exposure.

Remediation: How to store secrets in a mobile app (without hardcoding) →

Reference: CWE-798 · MASVS-STORAGE-1 — what the control asks for, and other apps with the same finding.

Evidence
1 recorded occurrence in the analyzed APK. These are distinct stored findings, not a count of every source match.
Verification
Static detection; current reachability is not established.
Open in all findingsRequest a correction
infoApplication data is backup-enabled1 occurrence

Interpretation & review guidance

The app allows Android backups (android:allowBackup="true"). App data can then be extracted via adb backup on many devices — a concern if the app stores tokens or personal/health/payment data locally. Common and low-severity, but worth disabling for sensitive apps.

Reference: CWE-530 · CWE-312 · MASVS-STORAGE-1 · MASVS-STORAGE-2 — what the control asks for, and other apps with the same finding.

Evidence
1 recorded occurrence in the analyzed APK. These are distinct stored findings, not a count of every source match.
Verification
Static detection; current reachability is not established.
Open in all findingsRequest a correction
View all 3 categories

Privacy

16 requested permissions · 0 flagged high-risk classes.

Review privacy signals →

Build & components

84 components recorded. Certificate parsing does not validate APK signature integrity.

Inspect build evidence →
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Findings

3 categories · 3 occurrences. Severity totals describe categories. Expand a finding for interpretation and review guidance.

lowFirebase Storage bucket reference1 occurrence

Interpretation & review guidance

A Firebase Cloud Storage bucket reference (the default <project>.appspot.com). Storing user files here is normal — it's only an exposure if the Storage security rules allow public read/list, which live verification tests.

Remediation: Fix a publicly readable Firebase database →

Reference: CWE-200 · CWE-284 · MASVS-STORAGE-2 — what the control asks for, and other apps with the same finding.

Evidence
1 recorded occurrence in the analyzed APK. These are distinct stored findings, not a count of every source match.
Verification
Static detection; current reachability is not established.

Evidence preview

Evidence type
Static string match
Representative location
resources.arsc
Recorded match
Pattern recorded; identifying value redacted.
Detector rule
firebase_storage_bucket
Recorded file locations
  • resources.arsc

1 recorded findings have inspectable metadata. Duplicate matches may share a representative location.

Review whether this belongs to intended app functionality or a bundled library. A static match does not establish runtime impact.

Preview evidence and Pro tools

Search recorded evidence and save private review notes with Pro. $99/month plus applicable tax.

Link to categoryRequest a correction
lowGoogle API key (client-shipped; restriction unverified)1 occurrence

Interpretation & review guidance

Android apps are designed to ship Google API keys in the client; Google restricts them by app signing certificate + enabled API. This is only a problem if the key is left unrestricted — presence alone is expected, not an exposure.

Remediation: How to store secrets in a mobile app (without hardcoding) →

Reference: CWE-798 · MASVS-STORAGE-1 — what the control asks for, and other apps with the same finding.

Evidence
1 recorded occurrence in the analyzed APK. These are distinct stored findings, not a count of every source match.
Verification
Static detection; current reachability is not established.

Evidence preview

Evidence type
Static string match
Representative location
resources.arsc
Recorded match
AIza•••••••• (21–40 chars, redacted)
Detector rule
google_api_key
Recorded file locations
  • resources.arsc

1 recorded findings have inspectable metadata. Duplicate matches may share a representative location.

Review whether this belongs to intended app functionality or a bundled library. A static match does not establish runtime impact.

Preview evidence and Pro tools

Search recorded evidence and save private review notes with Pro. $99/month plus applicable tax.

Link to categoryRequest a correction
infoApplication data is backup-enabled1 occurrence

Interpretation & review guidance

The app allows Android backups (android:allowBackup="true"). App data can then be extracted via adb backup on many devices — a concern if the app stores tokens or personal/health/payment data locally. Common and low-severity, but worth disabling for sensitive apps.

Reference: CWE-530 · CWE-312 · MASVS-STORAGE-1 · MASVS-STORAGE-2 — what the control asks for, and other apps with the same finding.

Evidence
1 recorded occurrence in the analyzed APK. These are distinct stored findings, not a count of every source match.
Verification
Static detection; current reachability is not established.

Evidence preview

Evidence type
Parsed app configuration
Representative location
AndroidManifest.xml
Recorded match
android:allowBackup="true"
Detector rule
manifest
Recorded file locations
  • AndroidManifest.xml

1 recorded findings have inspectable metadata. Duplicate matches may share a representative location.

Review whether this belongs to intended app functionality or a bundled library. A static match does not establish runtime impact.

Preview evidence and Pro tools

Search recorded evidence and save private review notes with Pro. $99/month plus applicable tax.

Link to categoryRequest a correction

Privacy signals

Capabilities and bundled software do not prove that data was collected or transmitted.

Requested permissions16
Flagged high-risk classes0
Detected SDKs6
Requested permission inventory (16)
  • android.permission.ACCESS_ADSERVICES_AD_ID
  • android.permission.ACCESS_ADSERVICES_ATTRIBUTION
  • android.permission.ACCESS_ADSERVICES_TOPICS
  • android.permission.ACCESS_NETWORK_STATE
  • android.permission.FOREGROUND_SERVICE
  • android.permission.INTERNET
  • android.permission.POST_NOTIFICATIONS
  • android.permission.RECEIVE_BOOT_COMPLETED
  • android.permission.SCHEDULE_EXACT_ALARM
  • android.permission.VIBRATE
  • android.permission.WAKE_LOCK
  • com.android.vending.BILLING
  • com.android.vending.CHECK_LICENSE
  • com.google.android.finsky.permission.BIND_GET_INSTALL_REFERRER_SERVICE
  • com.google.android.gms.permission.AD_ID
  • com.hungbok.benkyou.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

Data collection & flow (privacy signal, not part of the grade)

Data the app can access
Photos & files
Storage (write)
Persistent identifiers (referenced in code)
Advertising ID (AAID)Android IDDevice ID / IMEI
Where it can go
Third parties present (4)
Google AdMobGoogle Analytics for FirebaseGoogle Firebase AnalyticsGoogle Tag Manager
  • Persistent-identifier APIs referenced in code (Advertising ID (AAID), Android ID, Device ID / IMEI) with 4 analytics/ad SDK(s) present — the mechanism used for cross-app profiling.
  • Photos & files data requested with third-party analytics/ad SDKs present.

This maps what the app can access (permissions it requests, identifier APIs its code references) to the third parties bundled in it. It reflects capability and SDK presence — not proof that a specific value was transmitted.

Data Safety comparison is not conclusive because analysis coverage is incomplete or unknown.

Trackers & SDKs (6 detected · privacy signal, not part of the grade)

Advertising
Google AdMob
Analytics
Google Analytics for FirebaseGoogle Firebase AnalyticsGoogle Tag Manager
Consent
Google UMP (consent)IAB TCF

Build & components

Scanned build 1.0.6. Store metadata may describe a newer release.

APK SHA-256c4b86a8f99d3bed92bb9428282073e25b8c99ea37f768779b8f0d74090ea1d38

Signing certificate (who signed this build — factual, not part of the grade)

Signer
Google Inc. self-signed
Scheme
V3V2
Key
RSA 4096-bit
Algorithm
sha256WithRSA
Validity
2026-08-08 → 2056-08-08
Cert SHA-256
df:7f:d5:b6:5c:39:46:a4:52:97:80:dc:47:c5:6f:2f:db:f6:03:2c:7e:6b:cb:79:47:25:5e:95:f0:77:3e:9e

The certificate fingerprint identifies the parsed signing certificate. Knowing this public fingerprint does not establish ownership or validate the APK signature.

Signature integrity: not established by certificate parsing.

Component inventory

84 components. Advisory matching covers a curated set; no match is not proof that a component is vulnerability-free.

Bundled components and recorded advisory matches
ComponentVersionAdvisory matches
androidx.activity:activity1.13.0None recorded
androidx.activity:activity-compose1.13.0None recorded
androidx.activity:activity-ktx1.13.0None recorded
androidx.annotation:annotation-experimental1.4.1None recorded
androidx.appcompat:appcompat1.7.1None recorded
androidx.appcompat:appcompat-resources1.7.1None recorded
androidx.autofill:autofill1.0.0None recorded
androidx.browser:browser1.8.0None recorded
androidx.compose.animation:animation1.10.5None recorded
androidx.compose.animation:animation-core1.10.5None recorded
androidx.compose.foundation:foundation1.10.5None recorded
androidx.compose.foundation:foundation-layout1.10.5None recorded
androidx.compose.material3:material31.4.0None recorded
androidx.compose.material:material-ripple1.10.4None recorded
androidx.compose.runtime:runtime1.11.0None recorded
androidx.compose.runtime:runtime-annotation1.11.0None recorded
androidx.compose.runtime:runtime-retain1.11.0None recorded
androidx.compose.runtime:runtime-saveable1.11.0None recorded
androidx.compose.ui:ui1.11.0None recorded
androidx.compose.ui:ui-geometry1.11.0None recorded
androidx.compose.ui:ui-graphics1.11.0None recorded
androidx.compose.ui:ui-text1.11.0None recorded
androidx.compose.ui:ui-tooling-preview1.11.0None recorded
androidx.compose.ui:ui-unit1.11.0None recorded
androidx.compose.ui:ui-util1.11.0None recorded
androidx.core:core1.19.0None recorded
androidx.core:core-ktx1.19.0None recorded
androidx.core:core-viewtree1.0.0None recorded
androidx.cursoradapter:cursoradapter1.0.0None recorded
androidx.customview:customview1.0.0None recorded
androidx.customview:customview-poolingcontainer1.0.0None recorded
androidx.datastore:datastore1.1.7None recorded
androidx.datastore:datastore-core1.1.7None recorded
androidx.datastore:datastore-preferences1.1.7None recorded
androidx.datastore:datastore-preferences-core1.1.7None recorded
androidx.documentfile:documentfile1.0.0None recorded
androidx.drawerlayout:drawerlayout1.0.0None recorded
androidx.dynamicanimation:dynamicanimation1.0.0None recorded
androidx.emoji2:emoji21.4.0None recorded
androidx.emoji2:emoji2-views-helper1.4.0None recorded
androidx.fragment:fragment1.5.4None recorded
androidx.graphics:graphics-path1.0.1None recorded
androidx.interpolator:interpolator1.0.0None recorded
androidx.legacy:legacy-support-core-utils1.0.0None recorded
androidx.lifecycle:lifecycle-livedata2.11.0None recorded
androidx.lifecycle:lifecycle-livedata-core2.11.0None recorded
androidx.lifecycle:lifecycle-livedata-core-ktx2.11.0None recorded
androidx.lifecycle:lifecycle-process2.11.0None recorded
androidx.lifecycle:lifecycle-runtime2.11.0None recorded
androidx.lifecycle:lifecycle-runtime-compose2.11.0None recorded
androidx.lifecycle:lifecycle-runtime-ktx2.11.0None recorded
androidx.lifecycle:lifecycle-service2.11.0None recorded
androidx.lifecycle:lifecycle-viewmodel2.11.0None recorded
androidx.lifecycle:lifecycle-viewmodel-compose2.11.0None recorded
androidx.lifecycle:lifecycle-viewmodel-ktx2.11.0None recorded
androidx.lifecycle:lifecycle-viewmodel-savedstate2.11.0None recorded
androidx.loader:loader1.0.0None recorded
androidx.localbroadcastmanager:localbroadcastmanager1.0.0None recorded
androidx.navigationevent:navigationevent1.0.0None recorded
androidx.navigationevent:navigationevent-compose1.0.0None recorded
androidx.print:print1.0.0None recorded
androidx.privacysandbox.ads:ads-adservices1.1.0-beta11None recorded
androidx.privacysandbox.ads:ads-adservices-java1.1.0-beta11None recorded
androidx.profileinstaller:profileinstaller1.4.0None recorded
androidx.room:room-runtime2.2.5None recorded
androidx.savedstate:savedstate1.4.0None recorded
androidx.savedstate:savedstate-compose1.4.0None recorded
androidx.savedstate:savedstate-ktx1.4.0None recorded
androidx.sqlite:sqlite2.6.2None recorded
androidx.sqlite:sqlite-framework2.6.2None recorded
androidx.startup:startup-runtime1.1.1None recorded
androidx.tracing:tracing1.2.0None recorded
androidx.transition:transition1.6.0None recorded
androidx.vectordrawable:vectordrawable1.1.0None recorded
androidx.vectordrawable:vectordrawable-animated1.1.0None recorded
androidx.versionedparcelable:versionedparcelable1.1.1None recorded
androidx.viewpager:viewpager1.0.0None recorded
androidx.webkit:webkit1.12.1None recorded
androidx.window:window1.5.0None recorded
androidx.window:window-core1.5.0None recorded
androidx.work:work-runtime2.7.0None recorded
kotlinx:coroutines_android1.10.2None recorded
kotlinx:coroutines_core1.10.2None recorded
kotlinx:coroutines_play_services1.10.2None recorded
Export SBOM
About this app · store information

About this app

Learn words and sentences with audio, images, quizzes, and mistake review.

Content ratingEveryone
Download size145.2 MB
Privacy policyPublished →

Screenshots

App screenshotApp screenshotApp screenshotApp screenshotApp screenshotApp screenshotApp screenshotApp screenshot

Scan history

Each row is an observed scan. Gaps between scans do not establish how long a finding existed.

Scanned (UTC)BuildScoreGrade
2026-11-04 06:23 UTC1.0.6Not gradedNot graded

View changes between the last two scans →

Export & share

Exports describe the recorded assessment. Signed evidence proves origin and integrity, not completeness or safety.

SARIFFindings CSVCoverage JSONSigned evidenceSBOM

Coverage & gap matrix · Verify signed evidence

API users can request authenticated, scan-specific exports at /v1/scans/62a9f9d7-2aae-40c5-ae74-d5e7520cd20e/findings.sarif (also coverage.json and proof.json).

Request a correction or removal · How to interpret a scan · Browse apps