Malicious PDF — malware analysis report

Static analysis result for SHA-256 09610a1db7d405c4…

MALICIOUS

PDF

49.0 KB Created: 2020-08-05 09:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8620456fff847747ff94dbbaa16ffa5 SHA-1: a28386f221d0904753f6a9fb8cf9856c9228220e SHA-256: 09610a1db7d405c433a322d263bb82946ca0dc4938ff249837400619cb803b13
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify and other domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=acute+bronchitis+pdf+2020'. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded links are the primary vector for malicious activity.

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=acute+bronchitis+pdf+2020
    • http://files.mosbespokecakes.co.uk/uploads/1/3/0/7/130739970/1024b5ab6c21.pdf
    • http://files.stritto.com/uploads/1/3/1/1/131164399/8762382.pdf
    • http://files.abimyersart.com/uploads/1/3/2/3/132302824/rurokusutej.pdf
    • http://files.lucasregoborges.com/uploads/1/3/2/6/132681080/d7289a4cf003.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/1458/5509/files/mitose_cellule_vgtale.pdf
    • https://cdn.shopify.com/s/files/1/0437/5815/7982/files/51082256905.pdf
    • https://cdn.shopify.com/s/files/1/0434/3398/4161/files/durunonur.pdf
    • https://cdn.shopify.com/s/files/1/0434/6360/6429/files/need_for_speed_most_wanted_cracked.pdf
    • https://cdn.shopify.com/s/files/1/0431/7623/1063/files/bifujisaresuwasidubin.pdf
    • https://cdn.shopify.com/s/files/1/0431/6214/0840/files/6939586838.pdf
    • https://cdn.shopify.com/s/files/1/0430/6790/0061/files/vuwujojov.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7917/files/56150878657.pdf
    • https://cdn.shopify.com/s/files/1/0434/3591/7464/files/6487362484.pdf
    • https://cdn.shopify.com/s/files/1/0434/9345/8070/files/mavebozerak.pdf
    • https://cdn.shopify.com/s/files/1/0427/9202/6271/files/vanilla_wow_skinning_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/3555/0119/files/70444387700.pdf
    • https://cdn.shopify.com/s/files/1/0431/1167/8114/files/fujawefokonedefekeketuv.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/65995051682.pdf
    • https://medlineplus.gov/acutebronchitis.html
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073b0.bin
ca9d3aef5b850d7e2d35d4ee07cff679df14d7bfec4f924e8aae4c9a5809a565		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73B0 5284 bytes
font_01_sfnt_off00008595.bin
9949b55b48864cb3b8955704a673adfb7d08712ab3697aa0cf1e7893fc0fa740		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8595 10392 bytes
font_02_sfnt_off0000a90c.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA90C 4324 bytes

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