Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b93ce2b2960c652…

MALICIOUS

PDF

36.9 KB Created: 2021-05-15 03:31:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3e8656734e5ac9ddd1d850382e969c80 SHA-1: 78a0eb59033a6eb66f6d5decc90981c7ca0dfee1 SHA-256: 9b93ce2b2960c652e7d4c54ed1f203482e9202f779c70ddf2e7eb704e30cd5f3
170 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, specifically pointing to a 'free generator / game hack' lure. This lure is further supported by a fake CAPTCHA heuristic, designed to trick users into interacting with the malicious link. The embedded URL leads to known malicious infrastructure, indicating a phishing or scam attempt.

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/free-free-robux-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_off000031fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31FC 27456 bytes
SHA-256: 5c419845c6eacd3e3b21fd955a2d8d1def528980fe2710c0c770ff1b90e95578
font_01_sfnt_off00006faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FAA 18012 bytes
SHA-256: 3ef9e48aa3d97d4217e004f7625a8cbae9320a74231b80a01553f6433e422360

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