Malicious PDF — malware analysis report

Static analysis result for SHA-256 93afa875e04a9a39…

MALICIOUS

PDF

36.2 KB Created: 2021-05-12 23:05:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5912bf51e855847b2e701b7dd1b47b94 SHA-1: f253eba7714b78b89389eeedde70b47a9cb2de0d SHA-256: 93afa875e04a9a39f4e64dc356f470712bcfc33b0027e3b096c7ff0c90654e36
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links that redirect to known malicious infrastructure, specifically advertising a 'Coin Master Free Spins' generator. The document body and metadata confirm the use of wkhtmltopdf, and the heuristics indicate the primary purpose is to lure users to a malicious redirector. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier clean score 0.0283

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-spins-bit-ly-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_off00003430.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3430 24432 bytes
SHA-256: 6f267a33a7d112abce30c9065118f06b42d7fd7d71ffd3696004f7a49422d3ac
font_01_sfnt_off00006bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BFE 18280 bytes
SHA-256: 30193a21741cc5402413da2ce8c3dbb562d342d001498cd3d21d10b4bea75843

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