Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa9c80693c0f3760…

MALICIOUS

PDF

31.8 KB Created: 2021-07-18 23:43:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 65c6316e8a384980b4bce6129744edce SHA-1: 0bd4f50e32a82836b1d6bc85165c2a0489f4618e SHA-256: fa9c80693c0f3760f8d85cbc44ddd1ab1e0642eaba9910b809184e8ebbc73606
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9463

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 http://netcdn.tw/app/479516143/minecraft-building-hacks-game-hack PDF link annotation
    • https://www.prodex-holz.cz/images/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/tiktok-for-free_GM835599320.pdfIn PDF document text
    • https://www.prodex-holz.cz/images/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000263c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x263C 22992 bytes
SHA-256: 2136da8a7f7b3aba5c4147a8a6676d93ce35feaacfb96e49383e7fc1f84c842a
font_01_sfnt_off000059ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59CE 18628 bytes
SHA-256: 03be4b6b10a4c687c6c89c16a3bf013511456428a76c01e3ee63370f4522cf94

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