Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4645acdfff5d29…

MALICIOUS

PDF

28.6 KB Created: 2021-07-05 19:03:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 08e6c7d67beafcd992609165d72d5105 SHA-1: 796c966f79d741f1a83a98b86efd32594312c7e9 SHA-256: bf4645acdfff5d2970649518f5155e53e3219b702394fea7ba6bfc48046b746c
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically advertising a "free generator / game hack" for Coinmaster. The embedded URL, http://netcdn.tw/app/406889139/coinmaster-blogspot-game-hack, is identified as malicious infrastructure. The document body also contains a call-to-action phrase, reinforcing the lure to click the malicious link.

Machine Learning

  • Nyx PDF Classifier clean score 0.0330

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 http://netcdn.tw/app/406889139/coinmaster-blogspot-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_001_off000019f0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x19F0 23136 bytes
SHA-256: fbb2337f10d8cd7a71829a08310f5451a47892ea22ecae08604b60321eb9a94a
font_01_sfnt_off00004dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DD8 18560 bytes
SHA-256: c633d1bdcec2ec97d0cf5d0105340ca0f72dc1a1e70e85eb1730fe196c137425

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