Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9da1a6157fdd29a…

MALICIOUS

PDF

38.7 KB Created: 2021-05-10 12:45:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7f72d3dffe169ced141c6341c6d87471 SHA-1: b404e4bb5bbf5ded1be7779c0cfe2ac882833481 SHA-256: c9da1a6157fdd29a7123dd9a26adee3f1d4b6b1449df673293bd512bd29933a4
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to a known malicious redirector, specifically advertising a "game hack" and "free spins". The embedded URL, https://netcdn.xyz/app/406889139/app-store-coin-master-free-spins-game-hack, is confirmed as malicious. The document body also contains similar text and a call-to-action, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.0127

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/app-store-coin-master-free-spins-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000031e7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31E7 24528 bytes
SHA-256: f2d33e0c822122f9146005c5247bc782a8eeeabfa5272b3e0bf3d17fa1af1c2f
font_01_sfnt_off00006a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A43 3560 bytes
SHA-256: c953d730e49f69c7d62e02a926729ae4a31de13d9a976dc4a95b39cf47066c93
font_02_sfnt_off000076c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76C9 17884 bytes
SHA-256: 15d60cc77057721479c2c3ca49413555afe2d2a7cff89bd17ba391003fc80ca3

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