Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf84b31031ceffe…

MALICIOUS

PDF

47.4 KB Created: 2020-11-02 16:20:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d7bd4d2a494e160e2c6b8377d7295004 SHA-1: 9d377f61d686c9a6eacc3c918c38cfdc06d0bca4 SHA-256: 6cf84b31031ceffe919cc465d75a04402c52b88015cacf0264e113a9319a2880
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The embedded URL in the document body, 'https://cctraff.ru/strik?keyword=download+tunein+app+for+android', is a strong indicator of a phishing or scam attempt. The PDF also features a link farm, suggesting an attempt to manipulate search engine results or distribute malicious content broadly.

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=download+tunein+app+for+android In PDF document text
    • https://cdn-cms.f-static.net/uploads/4392472/normal_5f8f4085dc4e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379856/normal_5f8e7e08bfe03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389370/normal_5f8ec0135e75b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381090/normal_5f8e513a5e451.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403819/normal_5f99589cdea62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380700/normal_5f8d9e0c093a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393644/normal_5f92056319bb7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8115/7796/files/best_manual_therapy_certification_for_physical_therapists.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/2391/3927/files/vujebewegival.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5411/6263/files/tabasiwagawirupeno.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6761/1573/files/88360429103.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/1436/8665/files/ariston_av61_washing_machine_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c811f1b-d0d9-4de1-bf98-6a716c561f65/15515619903.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27d7fcfb-7566-42ba-9e63-cc229a50e146/zekegosuzibesu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E9B 4832 bytes
SHA-256: 8012bc530eab0fa3f756fdb9ee799c21bf76f810cfd237eac5c9bcc0cb272530
font_01_sfnt_off00007f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F29 10568 bytes
SHA-256: 556bba8a80905d7c37a35987d00e20ab028a295b5ff95ac7c45b98a0cab0e289
font_02_sfnt_off0000a30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA30D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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