Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc56ff6b7c0bf494…

MALICIOUS

PDF

40.9 KB Created: 2020-08-29 22:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 606de1c455c78a9c9f740139d1033d25 SHA-1: 29cbd54a5e885fec23f3881bbc4ca66ac7a19749 SHA-256: dc56ff6b7c0bf494ad3c515f60c23b816c0f07a5901f529b99eefc614bb9ea01
120 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to known malicious infrastructure via the URL https://ttraff.ru/wix?keyword=toilet+paper+toss. Additionally, the PDF_SEO_LINK_FARM heuristic fired, revealing a mass of embedded external links, with the first identified as https://static.usrfiles.com/ugd/b8c837_98a7132ed7234b72bab264bd7715e189.pdf. The document body contains garbled text but includes the redirector URL, suggesting a lure to external 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=toilet+paper+toss
    • https://static.usrfiles.com/ugd/b8c837_98a7132ed7234b72bab264bd7715e189.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c1c2a3713ab43eab5e5e0d28b856f2c.pdf
    • https://static.usrfiles.com/ugd/b8c837_623c16f8a7a44d1eaae6d3bf95a21b91.pdf
    • https://static.usrfiles.com/ugd/b8c837_0ad5dce24a5841b0bfda3ac696c1c899.pdf
    • https://static.usrfiles.com/ugd/b8c837_831ea1ebc0e44584ac9a44771be2d06a.pdf
    • https://static.usrfiles.com/ugd/b8c837_e303e836fcfc4286a25534a1be6a9e77.pdf
    • https://static.usrfiles.com/ugd/b8c837_feeda288822742148fcb0f58dd7efac9.pdf
    • https://static.usrfiles.com/ugd/5b604d_ab01c4942e584f069eb8668e4bddd264.pdf
    • https://static.usrfiles.com/ugd/b8c837_f035f8eec18649eebf6ec9c77deffc04.pdf
    • https://cdn.shopify.com/s/files/1/0428/0107/0247/files/27088972352.pdf
    • https://cdn.shopify.com/s/files/1/0433/6146/8571/files/medical_report_templates_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/0273/9362/files/18670073278.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3820/files/28162797237.pdf
    • https://cdn.shopify.com/s/files/1/0430/9552/3485/files/56054118601.pdf
    • https://cdn.shopify.com/s/files/1/0439/3412/2139/files/napefodajologujones.pdf
    • https://cdn.shopify.com/s/files/1/0454/2945/7064/files/autocad_electrical_2017_trial_version.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_off00006392.bin
c4534a99b910cb44604b03e46182fea6348941680aad852f18beea5f5f73d952		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6392 4760 bytes
font_01_sfnt_off000073ca.bin
2e48a3d22db884c01129dba5d01b84edddfc04871009725df5a6074214de2678		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73CA 10352 bytes

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