Malicious PDF — malware analysis report

Static analysis result for SHA-256 994fd05192f75194…

MALICIOUS

PDF

52.2 KB Created: 2020-07-27 00:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8d02023e06f25cad80277ba73b6b41b SHA-1: 6a4c4469c1cd21859663bf48b93cde53403f0b94 SHA-256: 994fd05192f7519458e268fbccb734ec18afb1ac47b3db10c0224a39519cfd73
150 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a common tactic for phishing or SEO manipulation. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates a link to a suspicious domain, ttraff.ru, which is likely used to redirect users to malicious content. The PDF_SEO_LINK_FARM heuristic further suggests that the document is part of a larger scheme to manipulate search engine results by linking to many external PDF files, predominantly hosted on Shopify. The ML_NYX_PDF_MALICIOUS flag strongly supports the malicious classification.

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.ru/wb?keyword=ct%20enterography%20protocol%20pdf
    • http://files.arifails.com/uploads/1/3/1/0/131070861/673a29c85ce507.pdf
    • http://files.karihayter.com/uploads/1/3/1/4/131453288/02767f5e47617.pdf
    • http://files.busybeeorganize.ca/uploads/1/3/0/9/130969004/gojebifazalomo-maxurapokenoxo.pdf
    • http://files.prairiewestbusiness.ca/uploads/1/3/1/4/131437593/1b0e40a1ede05.pdf
    • https://cdn.shopify.com/s/files/1/0437/6756/2392/files/7665308173.pdf
    • https://cdn.shopify.com/s/files/1/0428/7650/2175/files/nijosuj.pdf
    • https://cdn.shopify.com/s/files/1/0434/1966/4533/files/14226983739.pdf
    • https://cdn.shopify.com/s/files/1/0431/5054/0964/files/6223721044.pdf
    • https://cdn.shopify.com/s/files/1/0434/6285/2773/files/fefamo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6578/6006/files/90873413909.pdf
    • https://cdn.shopify.com/s/files/1/0431/7655/8746/files/nimabijariwip.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/52726752488.pdf
    • https://cdn.shopify.com/s/files/1/0428/2816/9375/files/51080633033.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mupesoxozuwimufuvijolus.pdf
    • https://cdn.shopify.com/s/files/1/0437/0923/5353/files/jejebenimon.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/
    • https://cdn.shopify.com/s/files/1/0434/1966/4533/files/142

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000890f.bin
5a39accf09d88840fa71c67a2b8b50968082fa7aef22e7745f7b94c40a5e73b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x890F 5104 bytes
font_01_sfnt_off00009a6e.bin
b7625332c6df1ac170f74083d216f22a343627515e956e7c3009d85fe64c4aa5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A6E 13080 bytes

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