Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ec220685403ede…

MALICIOUS

PDF

47.9 KB Created: 2020-08-15 15:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1beb6148f076d3680acd7a086458c20e SHA-1: 7703ebe712f63f04c6e8c6f3404d6d64a2862e35 SHA-256: 65ec220685403ede0c64d2d62494af61a45eb6b63e53addbbc9786ed81fb1108
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with a critical heuristic firing for a malicious redirector. The primary malicious URL, https://ttraff.ru/wb?keyword=tumores%20benignos%20y%20malignos%20de%20mama%20pdf, is presented as a benign document about breast tumors. The ML classifier strongly indicates maliciousness, and the presence of many external PDF links suggests a link farm or SEO poisoning attempt to distribute malicious content.

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/wb?keyword=tumores%20benignos%20y%20malignos%20de%20mama%20pdf
    • http://files.awakeningtouch.ca/uploads/1/3/1/8/131856860/04eb8921.pdf
    • http://files.atelierbe.com/uploads/1/3/0/7/130739596/8227cb1c60082.pdf
    • http://fusazif.empowerdifferences.com/uploads/1/3/1/4/131453145/1034033.pdf
    • http://gobafawiw.daveyoong.com/uploads/1/3/0/9/130969723/vegusaj_kemilupolebu_xotonifarokok_tirexoromupavoz.pdf
    • http://files.scoilsantain.com/uploads/1/3/1/8/131857565/bexejibajumege.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5367/0822/files/cae_listening_part_1.pdf
    • https://cdn.shopify.com/s/files/1/0431/5571/8298/files/vawaliveviboxovusumo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9656/4131/files/13045937831.pdf
    • https://cdn.shopify.com/s/files/1/0427/9202/6271/files/classification_and_regression_trees_leo_breiman.pdf
    • https://cdn.shopify.com/s/files/1/0435/8848/5288/files/fire_emblem_the_binding_blade_rom.pdf
    • https://cdn.shopify.com/s/files/1/0431/7557/5709/files/52173723175.pdf
    • https://cdn.shopify.com/s/files/1/0435/1747/7019/files/52399822091.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/romanesque_and_gothic_architecture.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lufixupiz.pdf
    • https://cdn.shopify.com/s/files/1/0440/1466/5878/files/common_stocks_and_uncommon_profits_summary.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_off00007b35.bin
5efc420ebff7fb32e4ef9946821579f5a936a2b2980e95539435ef6da3988d96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B35 5552 bytes
font_01_sfnt_off00008dff.bin
fb7acd9ee340a830e9204e7c3415d97de0e0cb6f41c03463cb7df2f73d70016c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DFF 10644 bytes

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