Malicious PDF — malware analysis report

Static analysis result for SHA-256 971089d710d3c5d6…

MALICIOUS

PDF

50.1 KB Created: 2020-10-31 00:47:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d55e6ca8499254a2933e3dcee79259d3 SHA-1: 9f3a555b98510bc328b14d7d3870a3f9da56af68 SHA-256: 971089d710d3c5d6aa80c12993732163a01e1e00f2040a2c195586c389478bc6
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting services and are likely part of a link farm. One critical heuristic identified a link to a known malicious redirector infrastructure at https://cctraff.ru/strik. This suggests the document's primary purpose is to lure users into clicking malicious links, potentially leading to malware downloads or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=delgado+critical+race+theory+the+cutting+edge In PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/7b2a3e0599e.pdfIn PDF document text
    • https://sabijodamibig.weebly.com/uploads/1/3/0/7/130775907/zelubuse.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365586/normal_5f8f731466742.pdfIn PDF document text
    • https://zipazoraxegav.weebly.com/uploads/1/3/4/3/134325660/jajatevod-pifuvosused.pdfIn PDF document text
    • https://nuvetifozeg.weebly.com/uploads/1/3/4/3/134358797/2dc2e7d8b7.pdfIn PDF document text
    • https://daletutanedura.weebly.com/uploads/1/3/1/6/131636587/fc60b04.pdfIn PDF document text
    • https://robivitoj.weebly.com/uploads/1/3/4/3/134334713/e72784ec82fc8c.pdfIn PDF document text
    • http:///\/images.contentreserve.com\/ImageType-100\/1779-1\/{3106417E-DF14-480B-9A58-9F48239EC6F8}Img100.jpg\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/9c445f5f-61ed-49c1-8580-3dbd280a4184/ruwuwupipekugavev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7125/0333/files/ssc_mts_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cadd61ab-5fcd-4f42-b815-86039b5fd8c8/wopebikajubekofot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8eeb9823-0117-46b3-9d1f-943f3581bdc7/king_arthur_pendragon_rpg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe8a1586-b163-4027-a4c9-872eff489245/36764173635.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36b48ea2-2a49-4314-a45a-763eba9fa930/ropivakowujozojisuluxaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46031dc7-3c3f-4c6d-861f-46aa36cd33f9/zurich_zr13_instruction_manual.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_off000081b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81B4 5124 bytes
SHA-256: a150436004ef6dd8be57adfbca622f9651464bb24be62c6c7e625c971bff6904
font_01_sfnt_off0000932d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x932D 12268 bytes
SHA-256: 6e6fc25008c61911bde7a02dfc6ce0d65dc393f1bd3a7968d371a03f75f64b97

Open this report in the interactive analyzer, or submit your own file for analysis.