Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf4d76d31488c9b…

MALICIOUS

PDF

50.0 KB Created: 2020-08-26 22:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9d3abc9c53224a9b200073f7dc40339 SHA-1: 77ec2bc97368bd21aeb1b448e82e3dd6c7bf8f4b SHA-256: 5bf4d76d31488c9b294b10e4c98c7df7bd233ff37a49bfc89440d0286b1cd12f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_SEO_LINK_FARM and the critical PDF_MALICIOUS_REDIRECTOR_LINK. The document body contains the URL https://ttraff.com/pify?keyword=the+jerm+msr206+utility, which is a known malicious redirector. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=the+jerm+msr206+utility
    • http://berek.adelanteyouthmission.org/uploads/1/3/0/8/130815097/d975c0234fcb09.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2105/7700/files/lorelikamevidalalifupad.pdf
    • https://cdn.shopify.com/s/files/1/0437/3259/8938/files/6562820360.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fadanamimurusekebunom.pdf
    • https://cdn.shopify.com/s/files/1/0435/8609/3214/files/bittersweet_symphony_string_quartet.pdf
    • https://cdn.shopify.com/s/files/1/0434/7248/6566/files/manoliganusajerujovapepu.pdf
    • https://cdn.shopify.com/s/files/1/0465/1086/6582/files/windows_10_pro.pdf
    • https://cdn.shopify.com/s/files/1/0428/9508/1625/files/acacia_catechu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0359/2353/files/honda_2hp_outboard_4_stroke.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007bd5.bin
1211e6316acf6caeafdb8c9f25c829d19e9c7523a0c90411290c9d5ed65ea700		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD5 5272 bytes
font_01_sfnt_off00008db6.bin
9b01a1b11e5d22bdccdad4943beb277cc696ed5992c4f604b663bf63a8861720		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DB6 14724 bytes

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