Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0efbc2de7f4ba83…

MALICIOUS

PDF

69.3 KB Created: 2020-10-03 23:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d5a5d7526dd553ae191559d8b93da837 SHA-1: fce3f07514c5a4ee0aeedafe1857b77dbaaf97c1 SHA-256: d0efbc2de7f4ba83e5baf2a168c1445437f4eb7abcf476139cbd3a2a93d672a5
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs that point to a redirector service, which in turn links to other PDFs, indicating a link farm or SEO poisoning attempt. The primary malicious URL is https://cctraff.ru/strik?keyword=cornelius+castoriadis+livros+pdf, which is likely used to lure victims. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to drive traffic to malicious infrastructure.

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=cornelius+castoriadis+livros+pdf In PDF document text
    • http://files.hnimakeithappen.com/uploads/1/3/1/4/131482874/9057129.pdfIn PDF document text
    • http://files.kstheauthor.com/uploads/1/3/0/7/130740440/466b5266786.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/5f4ea3fb-a02c-4d25-bf02-a5f4fc7ed3ff/kebaduronoreviwedoliwij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca2a1dfe-52d0-44e5-901c-40e9c7f737a3/guvejokisomonulusan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7398a618-34e7-4eb4-9fed-4675f2faa778/todejudosida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d38e526f-cbf2-439b-b78a-bdc93c94b3ba/47229932475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c646c4c-fb30-416f-b196-326fb794ad72/52767793773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b6b4a8b-b944-4de6-8608-136bf59160c9/76209056152.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7e344fb-0047-449e-b213-0766b22badeb/86678265968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5b86a85-6138-47f8-8b46-31bc664b2827/76773824517.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af0f589f-0654-4c9c-b69a-bfff289e6391/93048219844.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_off0000c51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51D 5116 bytes
SHA-256: ebb8fca0c1c75bba2146dac0bd1019e7dacf47cd2e5e57d91577b3c13b688140
font_01_sfnt_off0000d696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD696 17244 bytes
SHA-256: efb5f66d7de4395a1b523d0c04f60c4cfe5d1a41c6f448d83da4ce26c76615d9

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