Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d157064fcca8f8…

MALICIOUS

PDF

35.0 KB Created: 2021-05-10 10:33:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2a23f458a23c2355b9ec23b387a930de SHA-1: a40f6b2a00a8e6e50315d09a866a22d4a5f17930 SHA-256: 23d157064fcca8f898b5bf6ac7faa26ff97bce4b602567577fb82ad481c53124
130 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirector links, specifically targeting users with a "free generator / game hack" lure. The embedded URL points to known malicious infrastructure, suggesting an attempt to lead the user to a site that likely hosts further malicious content or exploits. While no scripts were directly extracted, the PDF structure and heuristics strongly suggest a malicious workflow initiated by user interaction with the link.

Machine Learning

  • Nyx PDF Classifier clean score 0.0306

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/431946152/free-robux-meme-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_off00002ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EA4 24524 bytes
SHA-256: e003183d1af90681050f065256ec3e5c7be2045e92fe6bdb0b1af6376bd405a1
font_01_sfnt_off000066ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66EC 18468 bytes
SHA-256: 3e6db3c9d7b90636a2057efa50536683edf8623f57b31e837fe721178fdf9957

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