Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f34ef013f35ab6…

MALICIOUS

PDF

31.2 KB Created: 2021-07-19 10:05:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d5d909c0bc0e258a41ecbf3261178c6c SHA-1: b5a7707516cdfcf9b806b7676f84c5ce8bbf37ee SHA-256: 67f34ef013f35ab6f2d7eb12aa5befb3127b6b28d174d1c402384d2396f86051
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to a URL associated with 'coin master free spins and coins', a common lure for phishing or malware distribution. The heuristic firings indicate the PDF links to known malicious redirector infrastructure. While no scripts were explicitly extracted, the nature of the lure and the redirector suggests the document is designed to trick the user into visiting a site that will likely attempt to download a second-stage payload or exploit a vulnerability.

Machine Learning

  • Nyx PDF Classifier clean score 0.0580

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/coin-master-free-spins-and-coins-today-gift-reward-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_002_off00002508.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2508 22812 bytes
SHA-256: f0f907baca4a8afa58d9c942ae255fb99d9be8aa5209ac160590b75edc358dc0
font_01_sfnt_off00005840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5840 18404 bytes
SHA-256: 20323906fae34ef48fb3028b175607ed26afea8233a7a83525bcd6516f32abbb

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