Malicious PDF — malware analysis report

Static analysis result for SHA-256 96ad365670ffc47c…

MALICIOUS

PDF

31.3 KB Created: 2021-07-19 18:52:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5146fd41c203b01bf824969851e3d0dc SHA-1: a6748009bbf679200636bc60847d58b3cceea5db SHA-256: 96ad365670ffc47c9344928ce036a30af6539330c7c3bea4e0e9e494f0654f95
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing indicating it links to a known malicious redirector, specifically advertising a "coin master claim free spins game hack". The embedded URL, http://netcdn.tw/app/406889139/coin-master-claim-free-spins-game-hack, is the primary indicator of malicious intent. While no scripts were extracted, the document's structure and the nature of the lure suggest it's designed to lead the user to a potentially harmful website, likely for credential harvesting or further malware delivery.

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-claim-free-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
font_00_sfnt_off00002673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2673 22672 bytes
SHA-256: bd1a630851d26dc5edef3c62f218213170341a892c13ffc083fcdff94f0b4619
font_01_sfnt_off00005935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5935 18220 bytes
SHA-256: 4508a7247666ecd7f475af3e2510e2d7297b60fda6d209b486c2dc6be28a63e8

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