Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2511c969982b8c7…

MALICIOUS

PDF

40.1 KB Created: 2020-10-16 15:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6ef66209baa0d9cb896aa4009c4aee10 SHA-1: 6e9aec16b9551f20233ea7f281850a48d0cc07b9 SHA-256: f2511c969982b8c7c7b7068546638a5ba0cf33b484b2dd004df5545813f6810d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation or to distribute malicious content. One of the primary links, 'https://ttraff.ru/123?keyword=metalurgia+fisica+para+ingenieros+pdf', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous links and the identified malicious redirector indicate a high likelihood of this document being used to distribute malware or lead users to phishing 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://ttraff.ru/123?keyword=metalurgia+fisica+para+ingenieros+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365600/normal_5f88854e8c5bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366337/normal_5f875f5a6a1f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368788/normal_5f89616a32a75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_5f871b054788d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_5f8765b76f375.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/rezareludufiven-voxodopi.pdfIn PDF document text
    • https://fixabugodorev.weebly.com/uploads/1/3/1/8/131856934/gagemawagelukef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366653/normal_5f871c0ab0ef4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367281/normal_5f87e39d1bec1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369774/normal_5f87ea1e46fa8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367312/normal_5f87ac39c0524.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371497/normal_5f88513981474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367944/normal_5f88bff67e7a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368468/normal_5f8814bcb1e85.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/49bf0186-0857-4690-a365-bb513540a7d7/tikadirix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/336cf37a-0f23-4b1e-a803-89b41b3bb078/28214544941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccee8c4e-5238-4de0-9261-a057036154b7/63488833449.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_off00005883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5883 5328 bytes
SHA-256: 917804e7ad46bcc06b1de9374582ec6558e258491a8287d78b54a9789ef9d283
font_01_sfnt_off00006ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB3 11852 bytes
SHA-256: b88c33d2deb467380964fedd2bfde3af03cf949c2e5f138d083bbd49a5225695

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