Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ff32fa6d3eea8f…

MALICIOUS

PDF

45.0 KB Created: 2020-10-03 06:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 878ce24b1a1d1cbdd45c0c4d3adc3d6d SHA-1: 92f3c2bce289cf7a7e6e32758bd5d96dd542bc0e SHA-256: c7ff32fa6d3eea8f7403ba346c55e624a4a1b53640b73221ad91598fa2e56f12
184 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 disposable hosting and redirectors, indicating a link farm designed to lure users to malicious sites. The presence of a link to a known malicious redirector and the ML classifier's high confidence score support this assessment. The document body itself contains obfuscated text and URLs, further suggesting malicious intent.

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=avery+cd+labels+template+5931++free In PDF document text
    • http://files.lakesheridanpa.com/uploads/1/3/1/1/131164202/6831385.pdfIn PDF document text
    • http://files.onwardhebrew.org/uploads/1/3/1/1/131163910/fovex.pdfIn PDF document text
    • http://dopumapim.britanniabeachcommunity.org/uploads/1/3/1/4/131408100/gabarifu.pdfIn PDF document text
    • http://files.vivekshah.net/uploads/1/3/1/6/131637239/laropanonele-sapidefiwaji-gijufo-davabosilab.pdfIn PDF document text
    • http://saguto.riinamakeup.com/uploads/1/3/1/3/131380042/8b7fbb7b47645c.pdfIn PDF document text
    • http://suximipin.shisko.com/uploads/1/3/1/3/131380480/xatetulili.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://uploads.strikinglycdn.com/files/708a5fa1-37d4-4df0-8fcc-2e3fbdb28da9/tufunuzawajojuweterela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bd0e6d3-da52-4532-a653-6fedd60cb5df/73328805178.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b9f4960-78bc-4f21-b701-df402823fb68/45425803101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8fd87c1-dd2b-40a5-a54a-0845bd5a0483/gowolubikowiregovo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cb9fc5f-5ba5-494f-b3b6-1409b99de984/padenamawilitodoja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3437/6352/files/comedy_central_activate.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3835/0231/files/19004199059.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_off00006131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6131 5612 bytes
SHA-256: 93b2362bb91291a11f89aca1bfb5126bd998d880a0a6f01a9cf25824e78c20a0
font_01_sfnt_off00007458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7458 10784 bytes
SHA-256: 9e705c7fd4bad0337240e2e1a6258719ac570464046b7b095e792de18b33533b
font_02_sfnt_off00009941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9941 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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