Malicious PDF — malware analysis report

Static analysis result for SHA-256 93fe561e27a2beb9…

MALICIOUS

PDF

39.1 KB Created: 2020-10-08 10:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: acce8e26c619cfdb57ebe90a29c82b4e SHA-1: 5c54656a0ca40713e6a71c624fc992f6fec2d847 SHA-256: 93fe561e27a2beb9e32e109248c2d77299eec09870b8838bea7cf2bf840dd2c0
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable domains and known malicious redirectors. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the document's structure and embedded URLs suggest it's part of a phishing or malware distribution campaign.

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=estructura+interna+de+la+raiz In PDF document text
    • http://files.coloquioespanacee1979-2019.com/uploads/1/3/2/8/132814136/jidagis.pdfIn PDF document text
    • http://files.aptecintl.com/uploads/1/3/1/4/131483138/3c964f21cd.pdfIn PDF document text
    • http://loxamoj.samanthagottlich.com/uploads/1/3/0/8/130874284/suzavowibim.pdfIn PDF document text
    • http://files.chezharold.com/uploads/1/3/1/4/131437799/voselud.pdfIn PDF document text
    • http://kofumuf.shinermotorsales.com/uploads/1/3/2/7/132711973/49c28ac.pdfIn PDF document text
    • https://site-1038311.mozfiles.com/files/1038311/rajofedak.pdfIn PDF document text
    • https://site-1037189.mozfiles.com/files/1037189/ragapapo.pdfIn PDF document text
    • https://site-1039768.mozfiles.com/files/1039768/43506057294.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/0b28e77a-2891-4ed1-9663-93d05b532005/xibuwomuko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d398274b-62ad-44ab-b95c-fa14c3b3b66f/diwugokosujopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bcd129e-e51a-40f0-8cce-213c196c52a0/sibulux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2778e0cd-fb63-486f-ba21-8a7dd5acb452/30845071870.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4dc7b16-75af-443e-9c38-76fcf8a30575/85444353118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/572a2557-e14b-4dc4-8c71-07289641ee71/63653199345.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20a0d616-6071-4c16-8276-071613e95d7a/19479692017.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_off00005c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C4B 4940 bytes
SHA-256: 2221af9f2a08e55bf2618eb623e001f3a7389a6dc83704941c72368edc414587
font_01_sfnt_off00006d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D2B 10288 bytes
SHA-256: b63add148fa5449e5cfdbf14f48692affac1727ef4fadd4b1e8d2cf0cec03c4f

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