Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e40967ecbdc72fc…

MALICIOUS

PDF

37.3 KB Created: 2020-10-30 12:43:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d3e7fa39b03ffff140a45ae2a1b1c056 SHA-1: edb9a2d40187b74ea2966c768a6c0f737f74a25b SHA-256: 6e40967ecbdc72fc72489bbf557377c6bedb4ec3fa2487d4a3d329fdf7092a51
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are part of a link farm, suggesting a malicious intent to redirect users to potentially harmful sites or manipulate search engine results.

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://gettraff.ru/strik?keyword=the+letter+h+in+bubble+letters In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369185/normal_5f8d0ae9ac858.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372087/normal_5f91be00ec1b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375199/normal_5f8933d2df6a4.pdfIn PDF document text
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/nisobepo-dumilevuvini-legime.pdfIn PDF document text
    • https://wemibevufiwoseb.weebly.com/uploads/1/3/0/8/130813314/8621fff2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426424/normal_5f9ae423caee2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373769/normal_5f9348cf6c2e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373248/normal_5f9215f4e1889.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/8cb3378f-3036-4ba0-bbdd-9d449cbd3c34/5702743775.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e5b6ce9-a544-48da-865d-7b8a8b32a838/pazulomopomirunud.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_off000055ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55AD 4652 bytes
SHA-256: 9ce5f1fae6fbe51a61a2e05eaecef42f84a525c2b3e636810d7a763295d8cee5
font_01_sfnt_off00006570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6570 10360 bytes
SHA-256: d0aab4d149d5ff96dbd8c5d567756a71500b93d7dc47d5e2a6fc9393b63d52ac