Malicious PDF — malware analysis report

Static analysis result for SHA-256 8695f050c57bd9dc…

MALICIOUS

PDF

48.5 KB Created: 2020-10-16 09:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 4605cfcd76967303655c57e1d11c7983 SHA-1: e52463334741a3c86a02049aa636623877ff67af SHA-256: 8695f050c57bd9dc187dadfe92df394ab7b60fbe0ee9bc2b67893da269d7eb1a
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://gettraff.ru/pify?keyword=nexus+7000+command+reference+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368741/normal_5f87e60132b51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369166/normal_5f87b83badb3a.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/c1286bb7-9ab5-4fe6-99f7-83d34e39ee79/zotatov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94779743-77b2-4eed-a925-f6738f005836/rasuzil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1546daee-baaf-49ad-a317-6e28276dce5b/95321647578.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd0733e7-e316-498d-913c-e5498bcc2209/86594674922.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b117492e-56cd-4023-9d95-92d6fe414cc0/81173187544.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ae531b6-36d3-4cb2-840b-a75ab672d43e/85295667868.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5edd4f6-9717-41e0-b662-3ef88c124c63/35680329859.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7364/2389/files/85025081742.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/1218/5000/files/protocolos_de_internet_tcp_ip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9212/4857/files/charles_proxy_android_settings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11389ef6-48f5-486e-b021-d68dc6f9d4a2/13475937024.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/995d0672-4e0a-4c67-8983-be788d4344ad/gesosekuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8f7d86c-3918-418e-a517-9c004f6c9fb6/69529538103.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ef93703-2bc4-49c7-9ba0-58d1e5efe17b/nexuro.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_off00007964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7964 5568 bytes
SHA-256: e7001968ada1d526d8876e5384a8687daac3c35de02dc60d94e7d805a453791b
font_01_sfnt_off00008c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C40 12608 bytes
SHA-256: 552b5158b6e1abc2b00837d0cbed39672c578a3cfa99021d27d76e780b280c01

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