Malicious PDF — malware analysis report

Static analysis result for SHA-256 21797b776c72126e…

MALICIOUS

PDF

36.7 KB Created: 2021-05-17 05:33:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 461aa6bfbe9149173ba9cf8720ac1331 SHA-1: e427961ff8836baf7f1cfd9678e364dfdff09ed6 SHA-256: 21797b776c72126e30c0a950e16c22eaad96ebef9361588ebfb1411e248e705f
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirector lure, pointing to a malicious URL. The document body explicitly contains the URL and a call to action to 'CLICK HERE TO ACCESS COIN MASTER GENERATOR', indicating a phishing or scam attempt. The embedded URL is known to be associated with malicious redirector infrastructure.

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 https://netcdn.xyz/app/406889139/free-spins-on-coin-master-2021-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_off000033f2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33F2 25528 bytes
SHA-256: d571584f08ed72ea8a20c517bbbdbd1472df0a8da6b522fa22d5367a9696bbb5
font_01_sfnt_off00006e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E16 18288 bytes
SHA-256: e7fc04cebd192de8ea685c8f65a9790caba4d729d1f53b0455241ee170bde56f

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