Malicious PDF — malware analysis report

Static analysis result for SHA-256 216d9ce8e62a6856…

MALICIOUS

PDF

43.5 KB Created: 2020-08-30 15:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c87ea184f07eced70f4acadbf2dea0e SHA-1: 6a65d1cfe2643a6bd2a33d44298d9ec2d93cc56f SHA-256: 216d9ce8e62a6856590e5022d54d850a7b037ca883a74ffe270e832b1487f0d8
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. This indicates the document is designed to lure users to a potentially harmful website. The presence of a large number of external PDF links, many hosted on CDNs, suggests a link farm or SEO poisoning tactic to obscure the ultimate destination. The ML classifier also strongly flagged this PDF as malicious.

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.ru/wix?keyword=ford+taurus+%25CF%2580%25CF%2581%25CE%25BF%25CE%25B2%25CE%25BB%25CE%25AE%25CE%25BC%25CE%25B1%25CF%2584%25CE%25B1+%25CF%2585%25CF%2580%25CE%25B5%25CF%2581%25CE%25B8%25CE%25AD%25CF%2581%25CE%25BC%25CE%25B1%25CE%25BD%25CF%2583%25CE%25B7%25CF%2582
    • https://static.usrfiles.com/ugd/cafc24_8a326b1fe2c74c75aec005969cd39aa4.pdf
    • https://static.usrfiles.com/ugd/b8c837_d967a99cd044451d89a542901f258b04.pdf
    • https://static.usrfiles.com/ugd/217d68_527c1703de494e9a8768e5622332e418.pdf
    • https://static.usrfiles.com/ugd/b8c837_af10a04a980c4568ba22dc6c15a8475b.pdf
    • https://cdn.shopify.com/s/files/1/0440/5306/9974/files/normas_de_auditoria_interna_imai.pdf
    • https://cdn.shopify.com/s/files/1/0431/0741/8273/files/livro_de_agrometeorologia.pdf
    • https://cdn.shopify.com/s/files/1/0436/1424/0931/files/77384379742.pdf
    • https://cdn.shopify.com/s/files/1/0454/2119/9516/files/14178858372.pdf
    • https://cdn.shopify.com/s/files/1/0430/8851/1130/files/ways_to_hack_clash_of_clans.pdf
    • https://cdn.shopify.com/s/files/1/0437/8345/4871/files/legovajaxovigebadelosap.pdf
    • https://cdn.shopify.com/s/files/1/0432/3662/2498/files/jezosuru.pdf
    • https://cdn.shopify.com/s/files/1/0432/1506/1153/files/fosujujam.pdf
    • https://cdn.shopify.com/s/files/1/0433/3253/4440/files/95784997486.pdf
    • https://cdn.shopify.com/s/files/1/0431/6754/7552/files/wudemegix.pdf
    • https://cdn.shopify.com/s/files/1/0433/9263/0940/files/79236743129.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_off000059c9.bin
45a5aade66dc92934738a1cabd87bda26948f57c210511beca8d10ad54af024f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59C9 6912 bytes
font_01_sfnt_off000070a3.bin
86dc733d486387e8d1bf6436615405b1cebda5521fde9a72bef443a466a7b6b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70A3 14696 bytes

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