Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a4afbbaa2df7ed…

MALICIOUS

PDF

31.5 KB Created: 2021-07-20 19:31:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c7a71d2eccbd5f0db754bea6a8da1621 SHA-1: 0d6db5aa25a7730602b2c008767d57ed81d94b64 SHA-256: 20a4afbbaa2df7ed7cd61c94ead838f6de7c888b4aa26acfdf70b01d04fb4912
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a lure for "Coin Master Hacks" and a prominent "CLICK HERE TO ACCESS COIN MASTER GENERATOR" call to action. This link redirects to a known malicious URL, indicating a phishing or scam attempt. The file's structure and embedded content suggest it's designed to exploit user interest in game cheats to redirect them to malicious infrastructure.

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-hacks-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_off00002906.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2906 22572 bytes
SHA-256: fdc6d467b2f098271cf4b424a62b168a142133a43fd59bd0d54cfaf97026f610
font_01_sfnt_off00005b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B68 17716 bytes
SHA-256: c15a8689411d8cca9ab0759ab4c496fe9b4353d676dd738e300719e9588112ed

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