Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b2b6955df94932…

MALICIOUS

PDF

49.0 KB Created: 2020-10-01 23:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: a5f3ccd7f48ca35d2374f436483c4794 SHA-1: e79c807dd610362b74491bfed2c6219289edd4d8 SHA-256: 31b2b6955df94932fff59d324e5cf736001881b711943b47fac9998e3945f7cf
194 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://ggtraff.ru/strik?keyword=no+soliciting+sign+for+house In PDF document text
    • http://files.greyallison.com/uploads/1/3/1/6/131637364/vonol.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://cdn.shopify.com/s/files/1/0464/8039/2344/files/zimumizovikizederene.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6753/4229/files/gobaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/2828/7127/files/primary_standard_solution_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02feabc2-a54f-4365-b8df-1da533e089a9/tibibewevefaxixavisudorag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0fbc4cb-b42a-466b-ad36-98a79b71e1f5/37052364836.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8c28cb5-d91d-4d06-a68b-54303353347b/78818939321.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f63e6ba2-d5fe-459e-8ebb-99531946d5d9/dipatevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adcd6859-a470-4c3c-b45c-b6538af5c64a/46901802993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d18549a-d31b-4e18-8445-79a0c9f5b3f9/vilazixeketod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45ff8bdf-3850-465d-a227-9d64a993eccf/71630075180.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06a55d28-aedf-4420-83d2-c0be1da0ffec/komilononarebisapixida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cae8cbcd-7958-489b-9c49-ca5b9d8f23d0/jowilojetekelipekot.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_off0000769a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x769A 4784 bytes
SHA-256: 6b1600068ba6149a97e5f377ac70d4e7473c97323971d6abb7ddc55400f00c82
font_01_sfnt_off000086da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86DA 10060 bytes
SHA-256: 762cf893f666890ecc81b0a88c1b6d322c0b33ff3c7b76e369b1b3452d62ab5b
font_02_sfnt_off0000a936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA936 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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