Malicious PDF — malware analysis report

Static analysis result for SHA-256 899e4c139573be23…

MALICIOUS

PDF

37.8 KB Created: 2021-05-15 07:03:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3ce1f2c9f28d934d7e8a2296d853cd20 SHA-1: 7da3d1a3e2ba499e7a6bd8a7cdf78251cbfab98b SHA-256: 899e4c139573be235017546ec6b36475f9825b2488b59482780160dde466b5d4
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a prominent lure for a "free Robux generator" and a link to a known malicious redirector. This indicates a phishing attempt designed to trick users into visiting malicious websites, likely for credential harvesting or further malware delivery. The fake CAPTCHA heuristic further supports the pretext of needing to perform an action to access the supposed generator.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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/how-to-get-free-robux-on-roblox-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
font_00_sfnt_off0000361e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x361E 25540 bytes
SHA-256: de63b678064d174ed14495e8fb1a80fbab154eaa8ead4ac5e5c97b851884bee3
font_01_sfnt_off00007107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7107 18756 bytes
SHA-256: 57ee29ca2df633c9559bea9da81b447a7ef2e0dffb4d388bdd233aaad46b31ec