Malicious PDF — malware analysis report

Static analysis result for SHA-256 121a1a94e2ee14e8…

MALICIOUS

PDF

35.4 KB Created: 2021-05-15 12:40:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f87bb446cab46c266be13e7a90c7f3b9 SHA-1: ac66e1dcb08ad7bccc67122255107623e5100d6a SHA-256: 121a1a94e2ee14e808c7dbbc6022d301d66fd19b1e1961a8e3febb1f66e22dfe
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a lure for a 'Robux Hack' and displays a fake CAPTCHA, aiming to deceive the user into clicking a malicious link. This link, 'https://netcdn.xyz/app/431946152/robux-hack-2021-game-hack', is associated with known malicious redirector infrastructure. The document's structure and content suggest an attempt to exploit user interest in game-related cheats to facilitate a phishing or malware download scheme.

Machine Learning

  • Nyx PDF Classifier clean score 0.0306

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/robux-hack-2021-game-hack In 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_off00002feb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FEB 24256 bytes
SHA-256: 5b91558cef1f5af09a17f5e762a607c08bd4b8a108045386d760abe20c7327be
font_01_sfnt_off000067b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67B7 18648 bytes
SHA-256: 960613bb0fa4c19a2503237e067522a4d484b1b5f3e7387dbdf2c2d9282ca05f

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