Malicious PDF — malware analysis report

Static analysis result for SHA-256 a75b1d3ae370421b…

MALICIOUS

PDF

35.9 KB Created: 2021-05-14 23:03:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 648252a32684d3c8ef1570014b9ae40e SHA-1: 758dceb184e4b68d65bd86d7757ac481a8f76f9a SHA-256: a75b1d3ae370421b082e53a0145c1e15c7d9117332d87cc65d2a5d43895dadf2
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to a known malicious domain, masquerading as a 'free generator' or 'game hack'. The document body explicitly contains the phrase 'CLICK HERE TO ACCESS COIN MASTER GENERATOR', reinforcing the lure. The embedded URLs are the primary indicators of malicious activity, suggesting an attempt to redirect users to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0282

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/free-coin-master-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
stream_003_off0000347d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x347D 24292 bytes
SHA-256: f8d2ed16a223d6eafbb717b1217712fc088f2a5e631f4e20990366acf901242e
font_01_sfnt_off00006c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C16 17884 bytes
SHA-256: dbba0adc3b1b7bb8b2e5e51fec5d28ab169e2f7a165ed2a14d616932af559aea

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