Malicious PDF — malware analysis report

Static analysis result for SHA-256 5737336bebc45689…

MALICIOUS

PDF

29.8 KB Created: 2021-07-19 07:22:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 3e5b33e85d17cc5302a4911fac37b0b5 SHA-1: 397d8054de47204ae55fd44ede51b6b46a628ae7 SHA-256: 5737336bebc45689b0f17c845387fcf42c2e1c2f3e2af09f70b7802a1058b509
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a malicious link disguised as a lure for free Robux or a game hack. This link points to known malicious redirector infrastructure. The document body also contains phrases like 'CLICK HERE TO ACCESS ROBUX GENERATOR', reinforcing the social engineering aspect of the attack. No scripts were extracted, but the primary attack vector appears to be a deceptive link within the document.

Machine Learning

  • Nyx PDF Classifier clean score 0.0556

Heuristics 4

  • 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.
  • 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 http://netcdn.tw/app/431946152/get-free-robux-com-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_off00001ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF1 22544 bytes
SHA-256: a617d79833a9fd9e704ab5684ca898d5fd72acccb674285d40958709d6375902
font_01_sfnt_off0000523c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x523C 18564 bytes
SHA-256: 9d935b1154b83d43f057013f62af94fe83dfa333e293d70844f56b73c3d99288

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