Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99c6bbbf434ae1e…

MALICIOUS

PDF

25.5 KB Created: 2021-07-05 10:40:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: cbd3449b6cfa26c1d13ecf4949974367 SHA-1: 4c6321ebda263361658320aa8dc6f54871da7f7d SHA-256: f99c6bbbf434ae1eb8b79db18cda5c9f1ca1c057220a0e86135489776b76d534
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for a 'free generator / game hack' which links to malicious redirector infrastructure. The document body explicitly mentions 'CLICK HERE TO ACCESS ROBUX GENERATOR', indicating a phishing or scam attempt. While no scripts were directly extracted, the PDF structure and embedded links strongly suggest a social engineering attack designed to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0312

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/who-to-get-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_off000012da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA 20576 bytes
SHA-256: 24505c5e89830cd6743be151909adc5d944dcd3657a45e83421b3b86d6777d25
font_01_sfnt_off00003f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3F3E 19184 bytes
SHA-256: 8d240f683c5a5d51cb605f4b06df9d271b22e3bf7dc4e657cba8cc5b4ea7a16b

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