Malicious PDF — malware analysis report

Static analysis result for SHA-256 a881d6580cc6006c…

MALICIOUS

PDF

61.3 KB Created: 2020-12-11 14:42:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: ada8d1ecccff7720f7bf52d97a373f21 SHA-1: d765a874cb969351520ca6e8d15a9aaf83526143 SHA-256: a881d6580cc6006caed3414cfb8357d33141167dc18305eea5bc0c61d086471f
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'traffking.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which are benign but serve to mask the malicious intent. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/strik?utm_term=unblocked+games+football+heads+2014-15+la+liga In PDF document text
    • https://tamalokumolegi.weebly.com/uploads/1/3/4/6/134656593/sijimifomekowerabal.pdfIn PDF document text
    • https://tixusevonatafix.weebly.com/uploads/1/3/4/6/134611731/6004603.pdfIn PDF document text
    • https://jaweditulopo.weebly.com/uploads/1/3/4/3/134313576/525425.pdfIn PDF document text
    • https://bupiwuzisulim.weebly.com/uploads/1/3/0/8/130874125/ef0d0654a339ec.pdfIn PDF document text
    • https://naroxelilokatud.weebly.com/uploads/1/3/1/3/131384214/dixemomot_boredirexokaj_nexiwufib_sepaniw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ff5b090-6f52-4ef3-90d0-091819277e1a/mass_and_radius_of_uranus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e7ceb61-1f57-4324-bcf5-5f046b9592f5/15602678352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/098aa2d1-99ba-41d4-9547-901106ca6e95/wenogezesudibubiwebogari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19572668-b1e5-4a6e-b03c-b1f6f90b194e/2737145315.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bc222d3-cc47-4b23-869c-4fc2ca7d3bb8/tebazexapubotadawok.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/leon_m_goldstein.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6124b32-1183-49e7-a61e-f7f136a639d0/27013744595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2ebdfd8-f654-452d-b27d-fa7b65253b66/amd_radeon_hd_6400m_series_driver.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A8 6104 bytes
SHA-256: 6d0d39c96a73d691966fd81224f3d0e8d1d970f814f08e85a489ecea60370c18
font_01_sfnt_off0000c666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC666 9892 bytes
SHA-256: da56df04ee11b152f0e5deead317fc0be4e7251e8050b2b366f4b0bb5ca5002a

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