Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa81ab5e5278ecb5…

MALICIOUS

PDF

37.6 KB Created: 2021-05-14 12:08:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-06
MD5: 125ec05f52d57cdbba1d4e02e215132d SHA-1: 97a517fc6c9cd0d6dffe8ba8a29b2baa1fb2ea8e SHA-256: aa81ab5e5278ecb506df3fbe98fe64eed15972ece0c2c973530f023c93eed4d3
130 Risk Score

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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/406889139/coin-master-free-gift-cards-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_003_off00003436.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3436 27504 bytes
SHA-256: 3225571e8ca961a88d7d7eb49bebe9dc52a78cdb4d85c4a9c1d30d46b4ee6011
font_01_sfnt_off0000730c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x730C 17884 bytes
SHA-256: 1b54ec21ee4dc5c6875d1e8706b9f848bdb88ccbf1458105623327cd7a4376f0