Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6f97c1e8073e65…

MALICIOUS

PDF

35.2 KB Created: 2021-05-12 10:31:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: ee10ee8ec078a7872056779753000147 SHA-1: 55e7b6d337fcb241a9a1c8e9ba5e8bc668ebd227 SHA-256: 5a6f97c1e8073e6572b30feb25133ab779e13bb6c88e43841350e721a4b2cacb
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1534 Unsubstituted Attack

This PDF document was flagged as malicious. It uses brand-impersonation credential phishing and a fake-CAPTCHA lure. 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 clean score 0.0306

Heuristics 6

  • 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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/get-robux-for-free-2021-game-hack.
  • 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/get-robux-for-free-2021-game-hack PDF link annotation
    • https://www.bandicam.comIn 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_off00003031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3031 24248 bytes
SHA-256: 437785953a594e09bc4a82748716825e03c9f47a9ca2449f2d86750aae43fd08
font_01_sfnt_off0000675a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x675A 18520 bytes
SHA-256: e088d92b388561e3a46dc194d915539325ab46261f90c1147848fe102ee4ee2d

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