Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b21c46e3b2ab9ee…

MALICIOUS

PDF

38.3 KB Created: 2021-04-28 05:19:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 241b2779e913f0633c3ae7d6459bbcd4 SHA-1: aac98a61f7ef7a6b7bbf05849cae5e2c71876486 SHA-256: 8b21c46e3b2ab9ee4be56b691e641793eda29abfd119a6ab378fe0a2412d60f0
132 Risk Score

Malware Insights

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

The PDF document contains multiple heuristics indicating a social engineering lure, specifically a "free Robux" or "game hack" scam. It directs users to external URLs, one of which is associated with a browser extension/update installation lure and brand impersonation (Netflix). The embedded URLs are the primary indicators of malicious intent, suggesting the document is designed to trick users into visiting malicious sites for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/free-robux-phish-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/free-robux-phish-game-hack PDF link annotation
    • https://freerobux.cyouIn 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_003_off00003893.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3893 25908 bytes
SHA-256: 21b9f03487d8122e2a6ef81e049d14ea41a5d619c37ca20bed6127b8538b13a7
font_01_sfnt_off00007427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7427 18456 bytes
SHA-256: 24cc79baa00b3a586916a27c64506ed0460278abc4fd3160a1016cdbeab2eb87

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