Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f66b3408edbb1d…

MALICIOUS

PDF

37.1 KB Created: 2021-05-13 12:11:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 0aae2473fced25199c5f9d1fe9e57ab7 SHA-1: b173f7cd477813bd7151db78c7499d7ede6dc6b7 SHA-256: 05f66b3408edbb1db5aa141bc0946057ff2c63f8e336e0aba5b5d515b81cef0b
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically pointing to a 'free coin master spins game hack' lure. The document body and embedded artifacts further reinforce this by displaying similar promotional text and a call to action. This indicates the primary purpose is to trick the user into visiting a malicious URL, likely to download a secondary payload or engage in further malicious activity.

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/free-coin-master-spins-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_off00003553.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3553 25672 bytes
SHA-256: 0a28476f4e69d7473411e301a19bbb36725fd9cd5680a057466607cd268c9da8
font_01_sfnt_off00007132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7132 17884 bytes
SHA-256: dbba0adc3b1b7bb8b2e5e51fec5d28ab169e2f7a165ed2a14d616932af559aea

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