Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e6d74116e422dc7…

MALICIOUS

PDF

72.6 KB Created: 2020-12-25 09:55:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e41ea12c1e8fdfd535936f8b754d720f SHA-1: 15ff7e32e20dbba77339563371fa296b6ed2e544 SHA-256: 3e6d74116e422dc7ebad156c3a376adc00d22533ba2ff59a89ec2ec64d86042b
244 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 disposable hosting services and redirector domains. The primary redirector URL, 'https://traffmen.ru/strik?utm_term=ufc+fight+night+results+live', suggests a lure related to current events to entice clicks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffmen.ru/strik?utm_term=ufc+fight+night+results+live
    • https://zapineri.weebly.com/uploads/1/3/4/7/134707132/2612347.pdf
    • https://cdn-cms.f-static.net/uploads/4373509/normal_5fd1f10e35302.pdf
    • https://vejefoxebeses.weebly.com/uploads/1/3/4/8/134860837/5948401.pdf
    • https://cdn.sqhk.co/dujujema/KShkIjd/globe_at_home_prepaid_wifi_review.pdf
    • https://xoxujodega.weebly.com/uploads/1/3/4/3/134363828/zoxot.pdf
    • https://wuwoxidip.weebly.com/uploads/1/3/4/4/134492879/dinar-mekenesev-puvomesejiji.pdf
    • https://wegakerovosa.weebly.com/uploads/1/3/0/8/130873826/xibax.pdf
    • https://cdn.sqhk.co/supetuzitepi/jixjjhh/pet_paradise_resort_houston_texas.pdf
    • https://nevutero.weebly.com/uploads/1/3/4/7/134716167/teluw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/aad475d1-f26b-4871-acf9-19933a5ceaa7/69760891781.pdf
    • https://uploads.strikinglycdn.com/files/f6f6792d-2711-4324-b443-78553c62ad00/government_transfer_payments_are_an_example_of_a_leakage_in_the_economy.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_off0000da09.bin
946a39ada0bdaca1b2b34cdb24104126bd7c3a9f0b4e846ac2a2d770e76398cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA09 4984 bytes
font_01_sfnt_off0000eb0f.bin
24d41e1e7cce640bbab0171f55e2e75bc13de7e7d374a75f7ab3348e86599fcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0F 14396 bytes

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