Malicious PDF — malware analysis report

Static analysis result for SHA-256 f991ef5b5ca354e0…

MALICIOUS

PDF

37.3 KB Created: 2021-05-10 20:33:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-13
MD5: d809bf3be321c7ad889f58fb3b146a9f SHA-1: fdc21f35de26c9d1f811474e0c1492b38c860149 SHA-256: f991ef5b5ca354e09e5cf48a8fc80a99ce9da240b3b49146b40e2b196d2d1e83
130 Risk Score

Machine Learning

  • Nyx PDF Classifier clean score 0.0129

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-hack-uk-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000318b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x318B 23876 bytes
SHA-256: 57d1957edb701699fe497beb1ccbac659c6b945c05737691795e798511551966
font_01_sfnt_off00006787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6787 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00007139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7139 17900 bytes
SHA-256: 8b08286b39ee800793478ac05285a8a4a04206bc09703d5245a76d9c2305ab31

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