Malicious PDF — malware analysis report

Static analysis result for SHA-256 32f23bae51f86b40…

MALICIOUS

PDF

28.4 KB Created: 2021-06-17 17:20:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6c35d32398f8abb477f78a6e51b5be04 SHA-1: 5598d08eabfce16ce1361cc7d3e45e53dee4bbb7 SHA-256: 32f23bae51f86b40e4ed7094e8914be62279417e3f18fb7e54870a79850865e3
130 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically advertising a 'free generator / game hack'. The embedded URL, http://netcdn.co/app/431946152/javascript-roblox-hack-game-hack, is also flagged as malicious. The document body contains a call-to-action phrase, reinforcing the lure to click the link, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier clean score 0.0330

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.co/app/431946152/javascript-roblox-hack-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_off00001830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1830 22376 bytes
SHA-256: c63dbf06dc63cbcd7902926312c1c8ade6b7d0f5f4fa7b6c94e7c1b2c1d7bfcf
font_01_sfnt_off00004a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A2D 19336 bytes
SHA-256: 77a245984eb196f9a5c71f4a1eb947adda306e00cd0875bc385a536621ea5578