Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b4e4d5ec844e8f…

MALICIOUS

PDF

36.8 KB Created: 2021-05-10 10:51:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c335221f7bcbc0ac3902138ba2f71d77 SHA-1: 2c86f5809dd0136dc847835107a031fbcf780a33 SHA-256: a5b4e4d5ec844e8fa2e7744563a978980993f4eed671e4f06828305617a5e421
70 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded text and a prominent link that mimics a download button for a game hack. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms that the primary embedded URL leads to known malicious redirector infrastructure. This indicates a phishing or scam attempt designed to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0312

Heuristics 3

  • 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-3.4-4-hack-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_off00003559.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3559 25224 bytes
SHA-256: 250bfd7e81b0b4aff62cf70cd53668dc176cf602e9bf33533bfd3a67013c743f
font_01_sfnt_off00006f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F21 18016 bytes
SHA-256: 12637fa898f8f880bac236962200324c713a71a6487c0e268acaa96303f78b9f

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