Malicious PDF — malware analysis report

Static analysis result for SHA-256 beb525dfb495e639…

MALICIOUS

PDF

39.7 KB Created: 2020-08-29 12:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc02f91060d82471e9a84ee13f6c8d6a SHA-1: e6c9c4c19fcab46236486937679e7e043ec14f0d SHA-256: beb525dfb495e639e4474d9653c1116138dcf8c5e0da4339ee20d017d5527e9b
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to 'Caterpillar 3516 parts manual pdf', suggesting a lure to trick users into clicking the malicious link. The file also exhibits characteristics of a PDF SEO link farm, with numerous links to external PDFs hosted on 'static.usrfiles.com'.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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.
  • 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.ru/wix?keyword=caterpillar+3516+parts+manual+pdf
    • https://static.usrfiles.com/ugd/b8c837_9c2822a9f28f4b95b2d64dc3fd33af63.pdf
    • https://static.usrfiles.com/ugd/b8c837_c59dde0f4c0644d98e617d6170bb45ed.pdf
    • https://static.usrfiles.com/ugd/b8c837_86d3e3027366436b80a3352bdbbf305f.pdf
    • https://static.usrfiles.com/ugd/b8c837_bd90fd5aa21c403b9fa69f9de514cb60.pdf
    • https://static.usrfiles.com/ugd/b8c837_e6dca6be2ea143498a8c50d95687a956.pdf
    • https://static.usrfiles.com/ugd/906e9f_f506d887204c4141a52f8c48cc6f08f3.pdf
    • https://static.usrfiles.com/ugd/b8c837_cee14021b15d486f9ed32e7362f66a60.pdf
    • https://static.usrfiles.com/ugd/b8c837_3242fbb5d0d34c3583bbbcd71ecc4925.pdf
    • https://static.usrfiles.com/ugd/b8c837_b08ff53c2f6d423aa3e356dd50584849.pdf
    • https://static.usrfiles.com/ugd/b8c837_1047222140094212abc2e0fb59586faf.pdf
    • https://static.usrfiles.com/ugd/b8c837_0f4d587ac53d4842a8a9de53f98e2172.pdf
    • https://static.usrfiles.com/ugd/b8c837_260a36ff4bd146d7914a3785e69143f1.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_off00005ad6.bin
a70b3a8131b95bfdf42fc1e2889d66b752886e169f1ab9c7be97c56a355077e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AD6 5584 bytes
font_01_sfnt_off00006dc2.bin
1b56abb376d23355ccdec4f6f4aa85e15f4aac8edfcdca7b57817ed22d6a70a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC2 10904 bytes

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