Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f25816ef28dd7fb…

MALICIOUS

PDF

41.9 KB Created: 2020-10-01 09:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 035c391f2a9759978ea4a37681968fd7 SHA-1: 673e94a304a9b85c8b0b496f501047bc4912a53c SHA-256: 6f25816ef28dd7fb178b2af86d1416417b97b96323b4c78cdda42865681c5cb7
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to other PDF documents hosted on various platforms. One of these links, 'https://cctraff.ru/strik?keyword=housing+lease+agreement+pdf', is identified as a known malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting an attempt to lure users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=housing+lease+agreement+pdf In PDF document text
    • https://site-1038762.mozfiles.com/files/1038762/13324906647.pdfIn PDF document text
    • https://site-1038739.mozfiles.com/files/1038739/22831336176.pdfIn PDF document text
    • http://files.agardenforknitters.com/uploads/1/3/1/4/131453651/ledudimijiwifiz-vatewi-zatus.pdfIn PDF document text
    • http://vobiw.lynncopes.com/uploads/1/3/1/3/131378932/1348136.pdfIn PDF document text
    • http://merinuf.drcogleysinnovations.com/uploads/1/3/1/0/131069910/rilonagonoriw.pdfIn PDF document text
    • http://seduzaz.ramblinadventureclub.com/uploads/1/3/1/4/131410012/ragazanofumexov_lubodemuvusu.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/a84eddff-68dc-4582-8e67-05880b36ddee/58014017751.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17acbfc1-d2a4-4cb9-918a-6291176f3b07/30052409045.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51bc21b3-5bf0-4acd-9b32-d78e49d10fec/dasatanewoveziwibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de63a309-0398-4634-8f82-a4c7dcbfad52/gufumunaredetafos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05fe91cc-f77e-415c-a25f-9acc14a3d714/xalevozu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5737/1546/files/fedesonigesoledelivabibej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2086/0067/files/38967523635.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_off000065bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65BB 5320 bytes
SHA-256: 99913d19233334768502441b16cfb9ffb57d5ffb944e7ffceb16fbe56b182a32
font_01_sfnt_off000077bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77BD 10364 bytes
SHA-256: 7609069cbcd5f199b734a72a6fe9bcd2f3ba8603d1c31c54e0326b187f3fab57

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