Malicious PDF — malware analysis report

Static analysis result for SHA-256 af72b3e577be3be7…

MALICIOUS

PDF

36.1 KB Created: 2021-05-17 00:00:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3c8b875bf4e3332c95f3d9ac1637e2a6 SHA-1: bc0cdbd74bed75922d2a00726043755747a80f03 SHA-256: af72b3e577be3be7a19392297ed44a86b56b3b940e8a0f5f6858e3d267727c9d
92 Risk Score

Malware Insights

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

The PDF document contains a high-risk heuristic indicating it links to a game hack generator, which is a common lure for malicious sites. The document body and heuristics also point to a fake CAPTCHA or human verification prompt, designed to trick the user into clicking the malicious link. The primary IOC is the embedded URL leading to this lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.0283

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-spins-hack-2021-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_off000032ea.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32EA 24988 bytes
SHA-256: 20ec35733b72747b36202ee9038bb8147db1fc900dfbea8b801efabe1d8514d2
font_01_sfnt_off00006ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BA2 18296 bytes
SHA-256: eaa60ab3b9dbdc46d7aef4d77b4227c1d0aeb4180c3635ae77be6ae4ebf58c24

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