Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1a6a4d94ab54f3…

MALICIOUS

PDF

43.2 KB Created: 2020-08-30 08:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aff4b7d1b86fa4c464a86f7bf90903c5 SHA-1: 07337a6c3362ddba7b13e817f0dd6bf4a0434323 SHA-256: 6c1a6a4d94ab54f3b0aa6f4da322db5ed7e1b51fa1372f93289a20322c13245b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, identified as a link farm, with a critical heuristic firing for linking to known malicious redirector infrastructure. The primary malicious URL identified is `https://ttraff.ru/wix?keyword=church+pew+parts`. The document body, though heavily obfuscated, contains references to this URL and other benign-looking PDFs, suggesting a lure or redirection mechanism.

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=church+pew+parts
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/d775a9_fe105ebd243741539b8d856702675362.pdf
    • https://static.usrfiles.com/ugd/b8c837_e1ab813243f5477a85799bbe9fb43ac4.pdf
    • https://static.usrfiles.com/ugd/b8c837_ccc1afd3305e43c09a1bb0b4e0afb32a.pdf
    • https://static.usrfiles.com/ugd/9cb927_0e50e81d2c1b451bb8b87a478cb3c740.pdf
    • https://cdn.shopify.com/s/files/1/0437/3564/6357/files/circulatory_system_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/1828/0357/files/ars_poetica_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0435/7790/1219/files/forbidden_woods_bloodborne.pdf
    • https://static.usrfiles.com/ugd/b8c837_a48fdc0217a64b83a2db0a0cd1c1a9d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_cf6d042501604a5ab710fa21e3333053.pdf
    • https://static.usrfiles.com/ugd/d54300_720e9661029b4455b736ec29cb69a45f.pdf
    • https://cdn.shopify.com/s/files/1/0440/1663/1973/files/20302577292.pdf
    • https://cdn.shopify.com/s/files/1/0437/7139/6257/files/rulosuti.pdf
    • https://cdn.shopify.com/s/files/1/0437/6159/8616/files/38589788833.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_off0000645e.bin
1d5d2e9e022f042bd3d853c85308563ca77cffbff36d623094fc4ba49cce8d77
pdf-font-stream PDF embedded font (sfnt) at offset 0x645E 4988 bytes
font_01_sfnt_off0000755c.bin
de2be00b0e45a9fac12929e7ad4ac54355adde96966ae9ca69afc680f59e7eb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x755C 12940 bytes