Malicious PDF — malware analysis report

Static analysis result for SHA-256 669164836533a4ee…

MALICIOUS

PDF

61.8 KB Created: 2020-10-05 20:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f6142814c0eb35f8a40b3f2f93afea36 SHA-1: 050fd5ce8ebfe76978d1f819c715b40c8f745738 SHA-256: 669164836533a4ee5ca759bf7df1b5765ed8df89d8a2c5cd9ef526bcd8cd0cbe
184 Risk Score

Malware Insights

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

This PDF file is identified as malicious due to its function as a link farm, directing users to various external PDF files under the guise of free downloads. The primary URL, 'https://gettraff.ru/strik?keyword=hindu+mythology+pdf+free+download', is flagged as a malicious redirector. The document's structure and embedded links suggest an attempt to manipulate search engine results and lure users to potentially harmful content.

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://gettraff.ru/strik?keyword=hindu+mythology+pdf+free+download In PDF document text
    • http://files.nextbuildingforum.org/uploads/1/3/0/9/130968943/goguxupudus-gofuxonut-milumimopenowu-komeku.pdfIn PDF document text
    • http://files.carolinacounselingwellness.com/uploads/1/3/0/7/130740166/444cab039.pdfIn PDF document text
    • http://files.coalitionforanimals.com/uploads/1/3/1/4/131410939/sajibuketuxododosupo.pdfIn PDF document text
    • http://files.thelifeatthehelm.com/uploads/1/3/2/6/132695219/mukazuk.pdfIn PDF document text
    • http://files.maggipivovar.com/uploads/1/3/1/6/131606798/kewazopidix.pdfIn PDF document text
    • https://site-1040000.mozfiles.com/files/1040000/89696930432.pdfIn PDF document text
    • https://site-1039478.mozfiles.com/files/1039478/kebamurosofove.pdfIn PDF document text
    • https://site-1037000.mozfiles.com/files/1037000/15019484871.pdfIn PDF document text
    • https://site-1041611.mozfiles.com/files/1041611/pezidisifamuli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/8612/2660/files/62861888078.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffa6030d-ad5c-4ccc-93f3-d212e379bd27/71004077063.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49cecdf2-ced5-448e-9cf6-1b9b0e7174e0/namomesiferitavobij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68bc7a4f-61bb-45e3-9050-3035f495c74a/85161885569.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8a7f3ce-a178-4b29-bf86-84dc3b1d2160/livijik.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_off0000a816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA816 5432 bytes
SHA-256: 841f5e44f43282bc85ff602c86c538d66105464f2f2d4d37528b5703cdd9953b
font_01_sfnt_off0000ba80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA80 15548 bytes
SHA-256: 6e99dbe097f4317704a2a02d3b79800a1b6be7fb460db7ae20355295b157c9b6

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