Malicious PDF — malware analysis report

Static analysis result for SHA-256 4570dc8b87fd4ac3…

MALICIOUS

PDF

46.3 KB Created: 2020-10-17 04:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: f84ad57d4dd10e22b24a3412d81b5d69 SHA-1: 985ceeacb6987576089bd268f20af41b621cb127 SHA-256: 4570dc8b87fd4ac3a44e39cd2bb67fe72fee60a6c118581508ed1baf6e22ffeb
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://cctraff.ru/strik?keyword=download+trey+songz+chapter+5 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374188/normal_5f8914baa79f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373986/normal_5f8a0da81d85f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369632/normal_5f8a4d08659ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_5f88f88a9f38c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375093/normal_5f8978f570790.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366321/normal_5f882bdb14a53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374376/normal_5f89ce3059a85.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/0df4e4ee-2329-457a-aaa7-0ace54a4bb5a/13824176627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/115623a4-84f6-4548-afed-17ad2d45908a/xufelisebaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d5a422a-32d4-4176-a8cf-fb5f6d560aef/zediponaderifunamebag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b60bdd8-007b-428e-862d-0f7b35838204/jupuvo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d01bb526-bd6d-4df2-aa38-f0f4dc6ebd59/xetuzudegejof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e453e8d-0146-43fa-b08e-86cfc86c3af2/14853008416.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fcc8054-3210-47c3-b87f-fe1c1fec436a/wipanutapojagebuwuwedujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4e2447d-ff66-43fb-8e18-db71e6bba9c7/65549881342.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c52573f3-e9a0-49ac-9d33-9d3333b2cf67/93769784436.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/710d4c8f-7448-4128-8bd6-4d84e1d03973/buboguwunepejapuxeba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58b02da2-4e2d-4662-8cd3-7fe1d55dfd2a/nuzovagafozupuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/3557/3663/files/42202620812.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/7231/8366/files/41230790664.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_off000075b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75B1 5700 bytes
SHA-256: b2799a36ce6c1b75ad03330109e93575502c6995727bf5e6eeb55496ad713950
font_01_sfnt_off00008941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8941 10128 bytes
SHA-256: 00556a9aaf6c2c30f3fedc713ef9bbca1499dc70e811ebe5cb20455b77451d56

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