Malicious PDF — malware analysis report

Static analysis result for SHA-256 a441a61aa5206732…

MALICIOUS

PDF

35.2 KB Created: 2020-10-11 07:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: e465bded1cfaff4412b3a474678a7a7f SHA-1: 9379372b0cf9c3b5200cff299f2bf83951f7f1f5 SHA-256: a441a61aa5206732798724edeeb67d77b99cb96cfa0b5f795df77273c7b9d6f6
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to external PDF files, which is indicative of a link farm. One of these links, https://cctraff.ru/strik?keyword=star+wars+dark+disciple+epub, is flagged as a known malicious redirector. This suggests the document is designed to direct users to malicious infrastructure, likely for phishing or to download further malware. No scripts were extracted, but the structure and embedded links strongly suggest malicious intent.

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=star+wars+dark+disciple+epub In 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/2072815f-0859-4dec-8d72-76ea33317396/5418825422.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4581fe9-ef5f-4d86-b1fe-250457527529/dosixanedaluvimav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec0ee9ae-ffcb-4fde-84b4-24595163befa/xaruzizexige.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5041/8847/files/braven_speaker_705_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9300/9604/files/80019730337.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10e4e69d-401d-4d02-a6a9-cc7ef118cfef/xafiworetebowojasix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7cd539e-3faf-4d89-ad96-a09421ee569c/75927281476.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/489956c6-ddc4-4cf7-b40d-f3f3ea454911/71548354864.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d90b1708-4eff-4085-86d1-421511c15f67/tulolonezijon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bf95028-9c53-47fa-bea1-a427c2c9886e/30234898321.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_off00004d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D6C 5468 bytes
SHA-256: 095e5b33d619683a228182fba620519a5afc02f03a1d69395622bb384b10815f
font_01_sfnt_off00006015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6015 9580 bytes
SHA-256: 888d518a63c6e402c7dbd324f9cb2ea3a4d942bda090f0a4936a6a1e9bec6a66

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