Malicious PDF — malware analysis report

Static analysis result for SHA-256 74dfc6383f0a3cd4…

MALICIOUS

PDF

35.5 KB Created: 2020-08-12 02:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 213371c2388a687982c921631a508049 SHA-1: 35d41ec7bc84e352aa3a864ce1521ee5e98a3789 SHA-256: 74dfc6383f0a3cd4104a04e91b501a7c0b0d632f43ba1d8e78b51c6acd9257df
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded links, with the primary link identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector identified by heuristics, suggesting an attempt to direct users to malicious content. The presence of numerous links, many pointing to Shopify domains, indicates a link farm strategy to potentially obscure the malicious destination.

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.cc/wb?keyword=outline%20of%20veterinary%20clinical%20pathology%20pdf
    • http://dolivarus.lisareimann.com/uploads/1/3/0/7/130775735/8561474.pdf
    • http://filekek.thefulfillmenthouse.com/uploads/1/3/2/6/132682076/442825.pdf
    • http://files.papasrefrigeration.com/uploads/1/3/0/7/130775310/6740717.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/4266/6656/files/77561378828.pdf
    • https://cdn.shopify.com/s/files/1/0435/7138/0383/files/convert_to_midi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5476/files/58221831069.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tokon.pdf
    • https://cdn.shopify.com/s/files/1/0428/4727/3116/files/10693869544.pdf
    • https://cdn.shopify.com/s/files/1/0432/8331/6891/files/3360675616.pdf
    • https://cdn.shopify.com/s/files/1/0437/3626/8949/files/bayonetta_2_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0429/5249/1159/files/fobipemi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6557/3537/files/neet_chemistry_syllabus_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/9275/5103/files/tuvibarudagax.pdf
    • https://cdn.shopify.com/s/files/1/0436/0175/6323/files/jiluda.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000040bb.bin
2982b0996760925c6ff43c860ef7ead3e123a79c28b5abafae86820e04d7bef3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x40BB 5312 bytes
font_01_sfnt_off000052d4.bin
d97345718d3fa5196e515eb6b98e3b02b6d743b08c2a3b6b865d007fdc81826c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52D4 9376 bytes
font_02_sfnt_off000072e5.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72E5 4324 bytes

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