Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff4242c9dcc7a9c…

MALICIOUS

PDF

36.2 KB Created: 2021-05-11 04:35:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f550d295e2805f2a699ea6c09ff65e97 SHA-1: 35e180b1e404d66535a242faa8c7653a6e027151 SHA-256: 8ff4242c9dcc7a9c0a39d9f1c082d0647e937d039926090b62f22cd9fa0b8ee9
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high-severity heuristic indicating it links to a game hack generator, likely a lure for malicious activity. The document body explicitly mentions 'Coin Master Free Spins' and 'CLICK HERE TO ACCESS COIN MASTER GENERATOR', reinforcing the social engineering aspect. The embedded URL points to a suspicious domain, suggesting the user is redirected to a site designed for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier clean score 0.0302

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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-spins-for-today-game-hack PDF link annotation
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000034ec.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34EC 24128 bytes
SHA-256: 68b0e4b626ab0613fbd69aacaa895281aed7ef915392dd645afe9fe4adb61c5d
font_01_sfnt_off00006c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C28 18240 bytes
SHA-256: a96ac7afd25cadbabafd1b9dbf0a180d0c1833ed2d07acb4363f122556c39d20

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