Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb721e4c02d1c510…

MALICIOUS

PDF

36.1 KB Created: 2021-05-22 10:06:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6fae7a0661544903e5a8b489b3295389 SHA-1: a4d83cbc840a28032c1b78e42cb7539545b6b299 SHA-256: cb721e4c02d1c510c4cc723206b2bcd931615770ca697980b3009a088594dbd2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to known malicious infrastructure, specifically promoting 'free generators' for popular games. The ML classifier also flagged the document as malicious. While no scripts were extracted, the document body and heuristics indicate a social engineering lure designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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
    • https://kojak-group.com/userfiles/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-role-in-coin-master_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/minecraft-116-free-download_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-make-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-tiradas-gratis-link_GM406889139.pdfIn 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_002_off000031b0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31B0 25396 bytes
SHA-256: 34b3472122188e33d396e9241d9ad7fb7a5740c7a5423b0d5a8c3391f8046ebc
font_01_sfnt_off00006b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B83 18288 bytes
SHA-256: e7fc04cebd192de8ea685c8f65a9790caba4d729d1f53b0455241ee170bde56f

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