Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dbc0093217947f8…

MALICIOUS

PDF

38.2 KB Created: 2020-10-18 11:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 73de4b822faf4613ada40b5efea7f6ab SHA-1: 13be983ea4c65ecc80e41a3b6f98439e644902ab SHA-256: 3dbc0093217947f8483f47bc9ded90171946ab711638f43eef750fb5aa26ab36
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, forming a link farm. One of these links, https://cctraff.ru/strik?keyword=de+midi+a+mp3, is identified as a malicious redirector. This suggests the document's primary purpose is to direct users to malicious infrastructure, likely for further exploitation or phishing.

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=de+midi+a+mp3 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369173/normal_5f8a822de5b94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367944/normal_5f89b760f00ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369632/normal_5f89796ce1945.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5f8b59ba3424f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369630/normal_5f885b7da8a4a.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/muzumopujubiwod_kemolalavobe_daxudi_rutexigejor.pdfIn PDF document text
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/3cc750bf2c5.pdfIn PDF document text
    • https://nobinetezo.weebly.com/uploads/1/3/0/9/130969761/gejaxuruxil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372378/normal_5f8a093f2ceb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375889/normal_5f8bf6b76a120.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367296/normal_5f8bf6129f3b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368505/normal_5f8ba4dfe92e8.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/9b8d3360-db18-43dd-a522-e56bee947de9/83072382212.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06086d3b-518f-4345-9c24-72ceac9af26f/72122906502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f70a910-d486-4203-a6bc-d7a969db2931/83437363056.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3b94763-d939-46b8-a3ca-f23d9fe74698/saduniwazumatogagov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/9993/6662/files/karya_tulis_ilmiah_akuntansi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9737/5388/files/wusorizubizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b7394aa-6ecf-4b40-af75-dd0eafad7da9/635886120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ebd593a-fc0b-4fdf-a6c6-a095e427c210/kifokefidazudole.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_off0000592c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x592C 4960 bytes
SHA-256: 38fefed75b6864767114354448fe01eed6f3d1e473dacc96644dfc0386b26cee
font_01_sfnt_off00006a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A03 9940 bytes
SHA-256: 610fabe08919c0618552d1d075289b4ae8ea419ffe432a60175fc63a8980c485

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