Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ae9db2b017978dc…

MALICIOUS

PDF

47.4 KB Created: 2021-05-17 19:09:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 08c7a98b7524aa52d371c3fd474abde3 SHA-1: a9e1587c3f728fae7d100175a20546804b833838 SHA-256: 4ae9db2b017978dc9bc4529f2fd75c647c9d9fb8f66784b25e610697a02b12f1
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains multiple embedded URLs that redirect to game hack and free currency generators, a common lure for credential harvesting or malware distribution. The critical heuristic for 'Recovery secret / private key request' suggests the document may directly solicit sensitive user information. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate a malicious workflow, likely involving exploitation to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

Heuristics 5

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.xyz/app/406889139/coin-master-free-coins-link-2021-deutsch-game-hack PDF link annotation
    • http://waldkindergarten-abensberg.de/images/coin-master-hack-no-download_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/coin-master-hack-mod-apk-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/coin-master-free-card-link-today_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/coin-master-app-free-download_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/martian-lettuce-coin-master-free_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/coin-master-gift-link_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/free-spins-coin-master-links-twitter_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/minecraft-java-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/free-vip-server-roblox_GM431946152.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/free-coin-master-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/coin-master-hack-app-ios_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a6a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A6A 28108 bytes
SHA-256: bf82b07ef086222f28a5a3a2d7df79fe746186f8d4842bcf090caadb5a6b5248
font_01_sfnt_off00008b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B59 2944 bytes
SHA-256: e8dca988325d5b5adea380508eed68725fcb814536e93cd420f224b7166adc23
font_02_sfnt_off00009584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9584 18756 bytes
SHA-256: cee569ad26c6995f0462545108d280bf76b2c9dfe620e2643f0a7a8ec4db527a

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