Malicious PDF — malware analysis report

Static analysis result for SHA-256 d72716b633cf8240…

MALICIOUS

PDF

42.3 KB Created: 2020-08-31 15:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 963b41c7f8dcbcb036622b62f74fae65 SHA-1: 11c0663de9ccc0fdb51bf065226e58ebad962ea6 SHA-256: d72716b633cf8240933ffc0b77812b00a02ba661fa8f58804d5e96e8fb67f832
120 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.ru, which is disguised as a document about pregnancy guidelines. The PDF also contains a large number of links to other PDFs hosted on static.usrfiles.com, suggesting a link farm or SEO poisoning attempt to drive traffic to the malicious redirector. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the document's content.

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=varicella+in+pregnancy+guidelines
    • https://static.usrfiles.com/ugd/930050_62d3333e25f14a0081471b593bcb70f6.pdf
    • https://static.usrfiles.com/ugd/6c032c_f00276c4702145ab95034f44eaf3b943.pdf
    • https://static.usrfiles.com/ugd/b910ae_cd76018ed52a4b8ba811fb8b3646d270.pdf
    • https://static.usrfiles.com/ugd/625844_b8c7a7e3ea654c54bdbd0f500926d4bd.pdf
    • https://static.usrfiles.com/ugd/b8c837_a88f861a8e144978a1b0cae6ecfa9142.pdf
    • https://static.usrfiles.com/ugd/b8c837_408e0eff55044fd68ccb7aff459136fc.pdf
    • https://static.usrfiles.com/ugd/b6edda_ebec07ebcf7540a597124e54f45bbf7c.pdf
    • https://static.usrfiles.com/ugd/91e123_46e2d97ac3174a1dad5c081a097ad950.pdf
    • https://static.usrfiles.com/ugd/1cc7e8_2cebfe308a0442fe927734d0c5bf115c.pdf
    • https://static.usrfiles.com/ugd/73cb9e_145ac555477f46a887ed9cc8fe59c102.pdf
    • https://static.usrfiles.com/ugd/dba42a_ace2f69ec40c48d288c0eff6f23abf24.pdf
    • https://static.usrfiles.com/ugd/b8c837_6366f00460ca466b9f98981ffee03785.pdf
    • https://static.usrfiles.com/ugd/493135_b46ebdb7812c4d3a9185d9633cf06b57.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_off00006537.bin
22323f6b82cb1cd70f7e98ed1af88a1e793bc2fad00762c9eb51cbfc8adf025a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6537 5308 bytes
font_01_sfnt_off0000775c.bin
3d263aba777f47f950af48a093921e1c6c06d56074ad9e87b868cfc8a48e7483		 pdf-font-stream PDF embedded font (sfnt) at offset 0x775C 10988 bytes

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