Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b4ff91fe57d67a…

MALICIOUS

PDF

40.8 KB Created: 2020-10-31 16:06:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 000b8d7f491b4dbb29b8c285d3bf976c SHA-1: 37d739b6b8c39f5da6aab0248d43172d3cba6950 SHA-256: c2b4ff91fe57d67afed767bd42d4577d76199b42bf7360914987d6f70d098cc1
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or SEO poisoning scheme to lure users to malicious sites.

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/aws?keyword=ice+house+america+parts In PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/1532254.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366311/normal_5f97813568768.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389816/normal_5f9939de1cbb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411498/normal_5f9725fcdc224.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424328/normal_5f989aa434c45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379726/normal_5f8a708bd4c70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385202/normal_5f8e62c6bce74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369916/normal_5f88dc9446c89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375907/normal_5f8a5b5912f2d.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/1/0499/8397/9680/files/roxakebarulotadupaxipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d9b8241-c113-41e0-9a40-1de3f40f3709/96001387448.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_off0000618c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x618C 5076 bytes
SHA-256: 0b7a49d5b537f18bbcc3fec9e6692903290b7952f59a9b94aa61617d78446560
font_01_sfnt_off000072a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72A2 10600 bytes
SHA-256: dd1c1367a1bf299654a3b1d452ff75c8481734775370d0609b73063f54e71069

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