Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4ea7a5d2d5e2ee…

MALICIOUS

PDF

75.0 KB Created: 2020-11-11 10:40:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc64246a85926ed09c1feeba5e51502a SHA-1: 2fb2cd8a7badf8c0d2c4104c8ba54a66ec4f9959 SHA-256: 3b4ea7a5d2d5e2eecefb555a7ed73a002945734ae917a1d9202d8f906e4874f2
214 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation or phishing. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://gettraff.ru/strik?keyword=mobdro+app+installation+for+computer', indicating a likely attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/strik?keyword=mobdro+app+installation+for+computer
    • https://lexizade.weebly.com/uploads/1/3/4/3/134368494/pewikal.pdf
    • https://vaxeratomox.weebly.com/uploads/1/3/4/3/134397216/zopesugepi.pdf
    • https://xumogaveranowiw.weebly.com/uploads/1/3/4/3/134371782/03b6f25d51e2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/66a8d7cb-863c-445e-a193-d5d1fa2ca724/71199686496.pdf
    • https://uploads.strikinglycdn.com/files/a709f271-9d48-419c-8f67-9d56e819ba06/simivusuraru.pdf
    • https://uploads.strikinglycdn.com/files/d83efe7c-547f-4a8a-a6f3-dd7ef3b4dffa/xuzexizebesikusivigu.pdf
    • https://s3.amazonaws.com/leguvefu/66162057247.pdf
    • https://s3.amazonaws.com/gixawetopoli/denenozuvudupu.pdf
    • https://uploads.strikinglycdn.com/files/99ada916-f26b-46a6-a193-29b7b50ba641/fomuda.pdf
    • https://s3.amazonaws.com/boxujetanonikuv/tuvononu.pdf
    • https://s3.amazonaws.com/tadovu/medmaps_for_pathophysiology_free_download.pdf
    • https://uploads.strikinglycdn.com/files/584ef339-cf30-4e01-9397-59df47bb5687/25165672649.pdf
    • https://s3.amazonaws.com/kizugokofo/dokulixugimitivilozupuz.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_off0000e984.bin
b4199787ffae4d4a6272d95fe496c7743bf9034229108c66ac6078758d5dd723		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE984 5448 bytes
font_01_sfnt_off0000fbfe.bin
07b7952445fcd6b2caacf1076d11ffd8eee6d72fd41c28d40e272e3a51121ec3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFE 10384 bytes

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