Malicious PDF — malware analysis report

Static analysis result for SHA-256 503b0814940c4cd8…

MALICIOUS

PDF

40.3 KB Created: 2020-08-31 23:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2939e00d5551e1481b7779bf44c914cb SHA-1: a5442d4cc45ec0a75972fedf8101d583d210726e SHA-256: 503b0814940c4cd8d46274e571e8e585769382383b39abeea60f73c6a00f6c70
154 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 'ttraff.com'. The document body, though heavily obfuscated, contains this URL and other PDF links, suggesting a lure to external content. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves redirecting the user to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.com/pify?keyword=problem+solving+questions+and+answers+in+reasoning
    • https://static.usrfiles.com/ugd/b8c837_909093583bfc4f7880e0198000c6c45a.pdf
    • https://static.usrfiles.com/ugd/99965f_38d6d0bcf25641b78cbfacc5a0ed22e5.pdf
    • https://static.usrfiles.com/ugd/8b9728_d96fbc5d776a4b6e98ee8bfddc6ab955.pdf
    • https://static.usrfiles.com/ugd/b8c837_da81ffc69bf14d968c624e05886684c2.pdf
    • https://static.usrfiles.com/ugd/b8c837_4467c5b00ebe4e0292dafdbfc202cd1a.pdf
    • https://static.usrfiles.com/ugd/913720_dfad034baf324890a61ec4da0fcfa17a.pdf
    • https://static.usrfiles.com/ugd/dc51bb_fcf9f257dd3d4ddfaac29d6c6e12d3bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_2695a57ed7294a5b84c87433aa773f5f.pdf
    • https://static.usrfiles.com/ugd/d54300_276bd177e3f845f3a8fefa713dc45f14.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20931566490.pdf
    • https://cdn.shopify.com/s/files/1/0439/3022/2747/files/jovuvetezogo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fdc.bin
4dae972c22cff6a1de790c9822600be19f43067d7b7a5dcee3f7ad211d37967d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDC 5564 bytes
font_01_sfnt_off000072b6.bin
c26146f6d8a4ad76227433835e44720de7e0fec1587aaff86bfdb4578f88ef3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72B6 9960 bytes

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