Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac5f03d7788c308e…

MALICIOUS

PDF

35.7 KB Created: 2021-05-10 10:06:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a68b7da2bd45e891371c701e416519a0 SHA-1: 54d000989c4da6da34f45c2378092fc04dc5e905 SHA-256: ac5f03d7788c308e65d9c04fbf28cf7409fb9f020b3cc55d94892307663c466d
130 Risk Score

Malware Insights

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

The PDF document contains a lure for a 'Coin Master Unlimited Spin Apk Free Download' and a call-to-action button, directing users to a known malicious redirector URL. This suggests a phishing or scam attempt designed to lead users to potentially harmful content or further malicious downloads. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier clean score 0.0265

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/coin-master-unlimited-spin-apk-free-download-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_off00003149.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3149 24120 bytes
SHA-256: 84b96f2268b765379dc47d291e5267a8f389b1e1000e0426f31ea94c2d64653f
font_01_sfnt_off000067d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67D6 19084 bytes
SHA-256: c2d82cd4a12004e31f0bd3c8b1caf06db58ba118ed59957898480102bbe81bed

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