Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8510c89ae79f6a…

MALICIOUS

PDF

43.3 KB Created: 2020-08-30 19:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8170a3028385cad111408352c499549e SHA-1: f15fd2a6d8ee0bfa72fb2f4ab5887fd6d7d4ff3e SHA-256: 3d8510c89ae79f6aa3786dd6163134b902f9e993a8937744c95d44e6d8101d53
120 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links pointing to external PDF documents, a technique often used for SEO manipulation or to host malicious content. One of the primary URLs, 'https://ttraff.ru/wix?keyword=k%25C3%25BCrt%25C3%25A7e+slow+m%25C3%25BCzik', is flagged as a malicious redirector. While many linked PDFs from 'static.usrfiles.com' are marked as benign, the presence of the malicious redirector and the sheer volume of links suggest a malicious intent, likely to distribute further malware or engage in phishing.

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=k%25C3%25BCrt%25C3%25A7e+slow+m%25C3%25BCzik
    • https://static.usrfiles.com/ugd/ee6770_f0fdd0d093b44edd8e5f0463a1565988.pdf
    • https://static.usrfiles.com/ugd/b8c837_57ad0a2968214d07a38c615ad713f612.pdf
    • https://static.usrfiles.com/ugd/9e14ca_a73bd90a18b14bc7a60e6e451bd6b61c.pdf
    • https://static.usrfiles.com/ugd/136d07_996f4282d2d44883a5e8a03e0a44fd24.pdf
    • https://static.usrfiles.com/ugd/b8c837_250efd67a331445ab6d6eff729935873.pdf
    • https://static.usrfiles.com/ugd/b8c837_f8e1fa5294e9462fba9e4c153de91158.pdf
    • https://static.usrfiles.com/ugd/b8c837_656e513a77274f1c97b5d609382164e4.pdf
    • https://static.usrfiles.com/ugd/6846fe_f376105f7d8a467f86ff781f42d8785c.pdf
    • https://cdn.shopify.com/s/files/1/0427/6640/1692/files/gilelagijixisababi.pdf
    • https://cdn.shopify.com/s/files/1/0428/0709/9558/files/67520108633.pdf
    • https://cdn.shopify.com/s/files/1/0450/0389/9048/files/excel_select_every_nth_row.pdf
    • https://cdn.shopify.com/s/files/1/0438/8411/8171/files/79458956327.pdf
    • https://static.usrfiles.com/ugd/b8c837_b128c3a141f74a0eb75a7d75772ce05b.pdf
    • https://static.usrfiles.com/ugd/b8c837_6a734cfefba04034afa32b3a9a67140d.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_off0000696a.bin
8c4e43d72410eb8eaa5fd0cf13a5582f7dfa9956f34177b4a5e5818d76386913		 pdf-font-stream PDF embedded font (sfnt) at offset 0x696A 5096 bytes
font_01_sfnt_off00007a98.bin
f87d7566e0765225676733ed8864b452777477f90ff5144bc2c9b228afcaf432		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A98 11752 bytes

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