Malicious PDF — malware analysis report

Static analysis result for SHA-256 c40e401757e389e8…

MALICIOUS

PDF

51.6 KB Created: 2020-08-31 04:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f39d638480eea3ab6520452d706f3c70 SHA-1: 23c68de72332088350564cd5cfa4c2636b87d1e2 SHA-256: c40e401757e389e8db0e0c3f3caba1b90ddf14a72c54ca669fb4e26bcbf43414
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=vince+flynn+american+assassin+free'. The document body, though heavily obfuscated, appears to contain this URL, suggesting a social engineering lure. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves redirecting the user to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ttraff.me/wix?keyword=vince+flynn+american+assassin+free
    • https://static.usrfiles.com/ugd/b8c837_364c39ecf41c4c21979d5df5588fe990.pdf
    • https://static.usrfiles.com/ugd/b8c837_04eef45f742f4f87acb1d72b3f3c0026.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e4e2a1d621446939847d2da4ef603dc.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4442/files/dejomigexijovav.pdf
    • https://static.usrfiles.com/ugd/b0b521_e808f10b181f466f844a4bdf25c98d5c.pdf
    • https://static.usrfiles.com/ugd/7ff653_87ef4fec87e843698ff7fd5816e8c8b5.pdf
    • https://static.usrfiles.com/ugd/b8c837_7746f27624a447689928a2356cdaa579.pdf
    • https://static.usrfiles.com/ugd/8b9728_074652da44294dd4a647bd9582d8c90e.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007fa1.bin
922c2619d0de48e10d0a46c8015b2fed95f6fa5ae5c7e446dda67f04085a9468		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA1 4692 bytes
font_01_sfnt_off00008f68.bin
611f254aef161a8f318f32587ced47e581a59192c7a91af7608a7537cc14b82d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F68 10076 bytes
font_02_sfnt_off0000b1e6.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E6 4324 bytes

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