Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfbd28f4e30add20…

MALICIOUS

PDF

36.7 KB Created: 2021-05-10 18:33:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 3a6ec6013e3e15d39b87ce9bd624a032 SHA-1: e2218bb9c70834544fec5c6d2db061c9c90c6a7d SHA-256: cfbd28f4e30add20d34682cbdd71762a005998a04091711b4d8c3f002b051912
70 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic indicating a malicious redirector link pointing to 'https://netcdn.xyz/app/406889139/coin-master-3.5-2-hack-game-hack'. The document body also contains this URL and a call-to-action phrase, suggesting the intent is to trick the user into visiting the malicious site. While no scripts were explicitly extracted, the PDF structure and the malicious link are strong indicators of a malicious workflow.

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-3.5-2-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_off000034a7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34A7 25244 bytes
SHA-256: 02238047e3eeeba5545c99bfbc1a939661cc423b8188698ec413188dd486dbf6
font_01_sfnt_off00006e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E56 18216 bytes
SHA-256: 2ce71f06b10a700cf3f084aa68b33ab002ddef2a56e6912d95d46e88b5551211

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