Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5bd9d3be0a1e8c9…

MALICIOUS

PDF

43.0 KB Created: 2020-11-04 15:07:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 943ac71326d7b34a1f41844dff540617 SHA-1: 9c4745852b167dd1ea9e894270cde5bb10d6754e SHA-256: f5bd9d3be0a1e8c9fffd3fd4de3dc7647949889931cdda6e18aa0cf52658c21d
154 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 external PDF files, forming a link farm. One of the primary links, 'https://cctraff.ru/aws?keyword=sidekick+tv+show+characters', is identified as a malicious redirector. This suggests the document's purpose is to redirect users to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=sidekick+tv+show+characters In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369149/normal_5f8b91522d53f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406202/normal_5f920107a03d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391602/normal_5f8fee486e478.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379603/normal_5f9d883f89f3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388426/normal_5f91f7456ec2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381976/normal_5f8f39f5c5a6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365624/normal_5f88d664c8156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5f870aaf9279f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386073/normal_5f925f6cb1894.pdfIn PDF document text
    • https://lunejuwibamir.weebly.com/uploads/1/3/4/5/134587588/fidenowukabebetuluwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369509/normal_5f95ed363c520.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/73419705236.pdfIn PDF document text
    • https://commons.wikimedia.org/wiki/File%3AThe_Partridge_Family_Cast_1970_No_2.jpgIn 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_off0000684c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x684C 5312 bytes
SHA-256: 45d93d20145415692321d95d9d499a41da3c26d3c9e250f6b9b1f47b3d195c9b
font_01_sfnt_off00007a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A73 10924 bytes
SHA-256: 8095a89383aa7512e5a5077b3d0cf8171a8dfff552c74bc1d52aaf3f3b9983aa

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