Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fba388dbf975bb7…

MALICIOUS

PDF

32.3 KB Created: 2020-08-13 13:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9a06be7db764b9774a50d6c3b7eed5b SHA-1: 6fed4da88c6e7ed57c0e0b15a463a53bb4bf1a22 SHA-256: 6fba388dbf975bb75416f0b3cedb6ffe0da9324a9c923410b2442a62fc632a67
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector link pointing to 'https://ttraff.ru/wb?keyword=hotel%20housekeeping%20training%20manual%20pdf'. This suggests the document is part of an SEO poisoning or phishing campaign, attempting to drive traffic to malicious infrastructure. While no scripts were extracted, the presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent.

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=hotel%20housekeeping%20training%20manual%20pdf
    • http://kaweg.highlandtigers.com/uploads/1/3/0/9/130969723/7d1d742e9127c5b.pdf
    • http://files.photographsbycarolmccullough.com/uploads/1/3/1/4/131452883/femeriwujo-vozukubupoba.pdf
    • http://files.mrskramlsclass.com/uploads/1/3/2/7/132740281/xelufatifoz_nobotuwilagi_tilixunowifor_lifaki.pdf
    • http://files.big-green-planet.com/uploads/1/3/1/0/131071256/7939165.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8276/0870/files/38071784502.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lekutaxawiwasutoxojopelor.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/52320532825.pdf
    • https://cdn.shopify.com/s/files/1/0435/4431/4024/files/statistical_methods_for_data_analysis_in_particle_physics.pdf
    • https://cdn.shopify.com/s/files/1/0432/5123/7022/files/bronchiectasis_review.pdf
    • https://cdn.shopify.com/s/files/1/0429/6278/0311/files/54866585514.pdf
    • https://cdn.shopify.com/s/files/1/0432/2256/5032/files/lajokukabifizu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9658/8967/files/muvesejopasoxisusosu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/46677619227.pdf
    • https://cdn.shopify.com/s/files/1/0429/7215/1959/files/tirevabuzosaviboli.pdf
    • https://cdn.shopify.com/s/files/1/0440/8049/6792/files/palopubevizufutorin.pdf
    • https://cdn.shopify.com/s/files/1/0430/2956/1495/files/les_maladies_cardiovasculaires_dfinition.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_off00004433.bin
bc244a128048c997b40bce201244488eb4f205942f9da301f79abf0b54153dac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4433 5480 bytes
font_01_sfnt_off000056a1.bin
58b76376b1d99679525e42e30f27f94e31d6cd51b097d1468795f0754552c7dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56A1 8636 bytes

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