Malicious PDF — malware analysis report

Static analysis result for SHA-256 c47176a9fae94964…

MALICIOUS

PDF

36.5 KB Created: 2021-05-12 23:30:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2418c5697602631eab7784c10d968ba7 SHA-1: 9bfa863fb782da4c66bc72a16e46cb2b13a994e2 SHA-256: c47176a9fae9496410755006bfc649e37357776cc71b08ad2a7eb2b9d7c31c9e
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple critical heuristic firings indicating it links to known malicious redirector infrastructure. The embedded URL, 'https://netcdn.xyz/app/406889139/coin-master-daily-spin-free-game-hack', is associated with a 'free generator / game hack' lure, aiming to trick users into clicking. While no scripts were explicitly extracted, the PDF structure and malicious links strongly suggest an attempt to redirect users to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0312

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-daily-spin-free-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_off00003456.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3456 25232 bytes
SHA-256: 2428bfe1ba7569d386c57a2e9970312d1958a982f821bbb8fa694f1f53239f52
font_01_sfnt_off00006d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D5B 18308 bytes
SHA-256: 213ea0fed5678e19eff32fcc5d46e69a4f1b73f67043b57a178cf12547108d4a

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