Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c2d537566fc49c…

MALICIOUS

PDF

41.2 KB Created: 2020-10-11 01:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: f6e546b54efc7ee726067613575de649 SHA-1: 9a8d3725de6c236210359a06a5ce6f3d339f1cb0 SHA-256: d8c2d537566fc49c693f20795c84d0ec5d14709c0f5c6348e9a0c92afe9a62dc
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though partially garbled, also contains URLs that are likely part of a link farm or SEO poisoning scheme. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to lure users to malicious 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://cctraff.ru/strik?keyword=split+multipage+pdf In PDF document text
    • http://simuvufom.noradragoon.com/uploads/1/3/1/4/131437792/nozejegizi.pdfIn PDF document text
    • http://files.gidannodza.net/uploads/1/3/1/4/131406248/pixuso.pdfIn PDF document text
    • http://files.marbella-lab.com/uploads/1/3/1/1/131163695/luxaj-gogigodaru-zafuxarip.pdfIn PDF document text
    • http://files.hjccustomdesigns.com/uploads/1/3/1/6/131606688/3171086.pdfIn PDF document text
    • http://files.backyard-studio-by-sheila.com/uploads/1/3/1/4/131438616/rosaw.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/4ae2bd52-35b1-4a44-a84b-e95aacdb1a10/fexegipurojeteberip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ee6eda8-b692-4d6f-97c2-edb97225ad19/lexumikuwoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fd431e1-5b7a-4496-9972-6a79ee118110/79759731577.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/731a66ac-d1e5-40b8-911b-e6ba15f7cf8f/lubugagug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c5e33b3-70b1-43d5-970b-e6f183bd0fd5/wadenodisexulufutetanave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2b06cb3-d4df-4f1f-98a6-50cd745bd011/jovow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e687e7ef-4df1-415b-86df-a3194c469288/5302625364.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59ceffc9-2843-48d6-a898-dde0a76ed3a1/vezunerekevak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4a1a778-21f2-4a21-bb0a-2648c2a3bb9e/99793496077.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_off00006253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6253 5188 bytes
SHA-256: 8b2b090c6a4550965f2ddd867b371a6cfd287f4a5b38ec8fffe5e80f9f9df317
font_01_sfnt_off000073f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73F0 10468 bytes
SHA-256: 53c45390cfe22f552fac8a1e623ce11cd70a95b5b923ab244f445143bfd9198b

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