Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4a74268fc7420d…

MALICIOUS

PDF

36.0 KB Created: 2021-05-10 22:35:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: aff242e749c9384bd6932ee3db92a871 SHA-1: f76124d996aacd991c80f18f749b3d9bd109e710 SHA-256: 6a4a74268fc7420dbba74abf8895a60579612e6098e5bf05e007406b935b3c85
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to a "coin master" game hack lure. The embedded URL is confirmed to lead to known malicious infrastructure. While no scripts were extracted, the PDF structure and heuristics strongly suggest a phishing or scam attempt designed to redirect users to potentially harmful content.

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-70-spin-link-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_off000032ff.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32FF 24684 bytes
SHA-256: 037d4f2a25dcc55a65ac958d230f0d633ee8875c9f3a4d662950b899f77ee6b8
font_01_sfnt_off00006b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B7C 18120 bytes
SHA-256: cf85675b6a38e731fca5e28061fbf46a28a3be773b5a4bb5d31cd4a045e3febb

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