Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa55a37af12b804…

MALICIOUS

PDF

36.8 KB Created: 2021-05-21 01:08:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6c9131eba6564729bc40442bf570bba4 SHA-1: 91fcd19571977cebc850cf60d96b74a1c0da7c4a SHA-256: 9fa55a37af12b804fc5a6edf7a1f5f8abf42f2d73a811f60fed906afe7301725
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 0.9447

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/431946152/how-to-change-username-on-roblox-for-free-game-hack PDF link annotation
    • http://alcomet.ru/images/coin-master-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://alcomet.ru/images/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://alcomet.ru/images/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://alcomet.ru/images/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://alcomet.ru/images/best-hack-for-coin-master-2021_GM406889139.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
stream_002_off000033cf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33CF 25248 bytes
SHA-256: cedead8066fe552d9df2db0e8b27ff00879c544d155bcf061b1e24cb4122e926
font_01_sfnt_off00006ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BA7 19240 bytes
SHA-256: 0a326c0d94e4ba5b42cc4a4255d11f6f465e6ea82f55ecdc2c3181a0308aa342

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