Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb6d982d85c6738e…

MALICIOUS

PDF

48.6 KB Created: 2020-10-01 14:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 96a7ab6c79f2640b853a87f11969eac7 SHA-1: faf1765ef872f83030e10c553295bca9f8bbd464 SHA-256: bb6d982d85c6738e2a9f72c0096b409fff0235cb69ca63e6d2b6f5b5ac9d6a77
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector, suggesting an attempt to trick users into clicking malicious links. The ML classifier also strongly indicated maliciousness.

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://cctraff.ru/strik?keyword=bearing+materials+pdf In PDF document text
    • http://files.momentum-lab.com/uploads/1/3/1/6/131636697/larebuwarex.pdfIn PDF document text
    • http://files.juliehui.co/uploads/1/3/1/6/131637896/1170513.pdfIn PDF document text
    • http://disotoku.nmoc.co.uk/uploads/1/3/1/3/131382271/2757029.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/3342/7873/files/letorapobobadetoku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0457/4435/7532/files/dawepavosukokev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4854/1079/files/canara_bank_personal_loan_application_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6277/1358/files/72103093589.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2946/2165/files/58996624193.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d567922d-85f4-4542-96b3-11febb122cfe/modezab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8b475bb-bcd6-44e5-9ce9-a1e8997a2d5d/12456960894.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_off000080fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80FC 5408 bytes
SHA-256: 5c4c69e54bcd8626176aaa62c5c99d13de9c23b8ae8cd1dafa73035cb1d862be
font_01_sfnt_off0000934f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x934F 10180 bytes
SHA-256: e49c6233cc76fc9cea2c771d1ea673dc0cdf78b46db1d295bcb7a15bebdc393b