Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e3e29925096c98a…

MALICIOUS

PDF

35.4 KB Created: 2021-05-22 22:49:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0b3768606833474cda33dccd8fa0ce1f SHA-1: 5407d1125b8a2acac5ae64ebc95b729eba829793 SHA-256: 8e3e29925096c98abd5f2ab6821362fa3288ae41844cde6bf6c9cb3e93e01f31
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a malicious redirector, specifically designed to lure users with a fake 'free generator' or 'game hack'. The primary embedded URL, https://netcdn.xyz/app/835599320/tiktok-fans-free-game-hack, is flagged as malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and heuristics strongly suggest an attempt to deliver a second-stage payload or phish credentials via the linked content.

Machine Learning

  • Nyx PDF Classifier clean score 0.0718

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 https://netcdn.xyz/app/835599320/tiktok-fans-free-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
stream_002_off00002a79.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2A79 28492 bytes
SHA-256: fb83a4cb3983a5f2309e54dad8fab98683d502f3b565114ec3a9dbddd6223fc3
font_01_sfnt_off00006b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B3F 17684 bytes
SHA-256: 22325babc2251f8239949cad6d45cc43a88f66264b3c8ea65c603fce63084c3f

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