Malicious PDF — malware analysis report

Static analysis result for SHA-256 334404a95c9b3f9e…

MALICIOUS

PDF

41.6 KB Created: 2020-10-09 14:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bdc8af5abe6033d9aa5ad5bb83ffc7ba SHA-1: 70fe9ec0d8bf10e17a8f0344fa086f76d58a6790 SHA-256: 334404a95c9b3f9ea1e77cac227e1fa4f6cb8fb96bbb3048110be5f0af6f4906
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a significant number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to redirect users to harmful sites. No scripts were extracted, but the primary attack pattern involves luring users through these links.

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=mr+bad+guy+song In PDF document text
    • http://files.delphieng.com/uploads/1/3/1/4/131407370/sugira.pdfIn PDF document text
    • http://xotura.teakslockservice.com/uploads/1/3/2/7/132740435/wezinemaniwume.pdfIn PDF document text
    • http://files.belkirk520.com/uploads/1/3/1/8/131857734/c0ca6e99200.pdfIn PDF document text
    • http://files.lubbocknorthyouth.org/uploads/1/3/1/4/131408572/af29f34bf1789c3.pdfIn PDF document text
    • http://pigesuke.thepresenteur.com/uploads/1/3/1/4/131453565/df4d47e.pdfIn PDF document text
    • http://files.cjautotechs.com/uploads/1/3/2/6/132681513/4b04c4640d2.pdfIn PDF document text
    • http://devonoje.jasheridan.com/uploads/1/3/0/7/130739802/gotabopinavefe.pdfIn PDF document text
    • http://zemepo.kyocreations.com/uploads/1/3/1/8/131856214/zudumazesagib.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/bbc5ad50-4d5a-402d-a320-b2e20bcfa873/76120648125.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89bdbabb-cb9c-4819-91c1-1c940c3b7106/1453085024.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/027131da-74c9-4722-9ad7-3e75f9619371/zizojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a6b89a3-e34a-40a6-bdb0-0a7afa68765d/duwakapovajed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1945640f-0c77-4b9c-bae1-f61b40195929/65805212974.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9cdb1fb-879a-4193-bc51-2fc967f37b12/14562050861.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a76d49c-d8a6-4f69-b8ac-9eb1e5053ae8/10582640466.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18d48211-7a0c-4a47-879a-4fb6f8bdb0d9/tuwusuxer.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_off00006628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6628 5208 bytes
SHA-256: e2ab26674858ff93c74d760c907217ba7d51ac67634e0e8b5aef99c473582ad8
font_01_sfnt_off000077f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77F7 9948 bytes
SHA-256: 59ac00669a300d90821569e82ade314a91077c24389048314184523f0ace985c

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