Malicious PDF — malware analysis report

Static analysis result for SHA-256 df2eb5328a5d4d88…

MALICIOUS

PDF

41.9 KB Created: 2020-09-07 22:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bec01962d403b1533a82e759c77f9a64 SHA-1: 517c627e5dddc82a6c2dc6661ccffb7b8195bcae SHA-256: df2eb5328a5d4d88d91d2c45c99ab5979613c84add701d033b9c98065e85d570
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.me, which is disguised as a sample checklist in Excel format. The PDF also features a large number of external links, many pointing to static.usrfiles.com, suggesting a link farm or SEO poisoning tactic to improve search engine visibility for malicious content. The ML classifier strongly flagged this PDF as malicious.

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.me/pify?keyword=sample+of+checklist+in+excel+format
    • https://static.usrfiles.com/ugd/d4df0f_9c3806503ef4488c8a08f843fe40d3a3.pdf
    • https://static.usrfiles.com/ugd/eaf48f_5b2bdd72de954286a587482cf9fe1361.pdf
    • https://static.usrfiles.com/ugd/0511f5_2ba510d36c6c4430a17f0cde344dcb83.pdf
    • https://static.usrfiles.com/ugd/760101_0c920cf69dfd41b5b241870c352c4a4a.pdf
    • https://static.usrfiles.com/ugd/1e32c2_5859d54c4cc44a35bfbfe7eff71f9a45.pdf
    • https://cdn.shopify.com/s/files/1/0439/0574/5051/files/chaconne_yiruma.pdf
    • https://cdn.shopify.com/s/files/1/0431/8039/2609/files/59367048578.pdf
    • https://static.usrfiles.com/ugd/5e8de6_9a5063e3cd4f49a9939381500b52bf34.pdf
    • https://static.usrfiles.com/ugd/144d27_b264cd07fb144de69f870ad66f95b43e.pdf
    • https://static.usrfiles.com/ugd/99afdc_94acf4cb8934457988bfdc724caab2cb.pdf
    • https://static.usrfiles.com/ugd/7d21c0_27641a76bac04935a0944b856f444285.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_off0000653c.bin
bb0518f10c6ad3ccd2bbfebb6f610a485cad451c2840dfd901ed5069bf311155		 pdf-font-stream PDF embedded font (sfnt) at offset 0x653C 5488 bytes
font_01_sfnt_off000077c4.bin
a17eafa297ca4a8c176e6ac55dc503b48638ea9fc8b0bcbec5dc34ec1cc41f2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77C4 10208 bytes

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