Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf81018233250a6d…

MALICIOUS

PDF

38.6 KB Created: 2021-05-20 20:16:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4c3f4175004ed8c472ee7750a328a77d SHA-1: c4fc570bccf7a8e16a613e1632ae8d6197906d08 SHA-256: cf81018233250a6df4d98e36f754832f741c8e3964ffd6c13223fed5d3efe886
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple embedded URLs and a prominent call-to-action to access a 'TikTok generator'. The heuristics indicate that the primary link leads to a 'free generator / game hack' redirector, suggesting a social engineering lure to trick users into downloading malicious content. The ML classifier also flagged the PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

Heuristics 4

  • 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/835599320/free-tiktok-fans-and-likes-game-hack PDF link annotation
    • http://firesafetyservices.biz/images/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/spin-rewards-coin-master_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/public-enemy-sun-prairie-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/free-roebucks-no-human-verification_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/coin-master-daily-gifts_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_002_off000031d6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31D6 25948 bytes
SHA-256: 2981cfa1152c9dcbde137adbbbd8bdf3485db4db5f2f7c39faa52adc76ec9eab
font_01_sfnt_off00006ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA5 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off0000768b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x768B 17856 bytes
SHA-256: 73670565195d1614abdebf4593265cc7a8d42409e9f7addc13b51e248eeb6564

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