Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf731cf9db1aa58…

MALICIOUS

PDF

44.5 KB Created: 2020-07-30 08:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18c81463383174897e08a499e918fa93 SHA-1: aa07bc7797e0bd9ffe63945e3d21b29a85b42549 SHA-256: 6bf731cf9db1aa586647a17990f772320a6e10bca17dd2df43027936b3b8e5f9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'ttraff.ru'. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a large number of external PDF links, suggesting a link farm operation. The ML classifier also strongly flagged this PDF as malicious. While the document body is heavily obfuscated, the presence of these links and heuristics strongly suggests a malicious intent to redirect users to potentially harmful 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/pify?keyword=topology+optimization+ansys+pdf
    • http://files.rvstore.org/uploads/1/3/0/9/130969403/6657852.pdf
    • http://files.littlesistershop.com/uploads/1/3/1/3/131379940/5784647.pdf
    • http://files.berginmusic.com/uploads/1/3/1/4/131406507/299a905e7ebc70.pdf
    • http://files.jamesculbertsonphotography.com/uploads/1/3/1/4/131453247/moparawilekevov-fatuja-poxuguda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4601/0022/files/vobulewew.pdf
    • https://cdn.shopify.com/s/files/1/0431/1669/1612/files/54308243535.pdf
    • https://cdn.shopify.com/s/files/1/0436/3767/0041/files/90227977431.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3429/files/tufevexawomob.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/54811910508.pdf
    • https://cdn.shopify.com/s/files/1/0434/6488/4384/files/vikikewaxug.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/5561128363.pdf
    • https://cdn.shopify.com/s/files/1/0434/5715/1142/files/zewabajinomixerujejofuv.pdf
    • https://cdn.shopify.com/s/files/1/0436/0116/6498/files/baxiwawaxabapigov.pdf
    • https://cdn.shopify.com/s/files/1/0431/0974/4789/files/40810750538.pdf
    • https://cdn.shopify.com/s/files/1/0432/5238/3907/files/57602404825.pdf
    • https://cdn.shopify.com/s/files/1/0435/6499/0632/files/79722193412.pdf
    • https://cdn.shopify.com/s/files/1/0431/1239/9010/files/bisiguxutevoke.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_off00007146.bin
7d2fc9f54dd268021fc5461d150ac4a9903cea0e1617576b21e9f553f2e0cdd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7146 5036 bytes
font_01_sfnt_off0000825c.bin
fe1fb2dba92c5f60c2722b81cc8e8e39509f6cd53a7e7e734fc297d85e926346		 pdf-font-stream PDF embedded font (sfnt) at offset 0x825C 10084 bytes

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