Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4855947fe44b53…

MALICIOUS

PDF

42.0 KB Created: 2020-10-31 13:55:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 3cc038ce3c53e0f951b033a856bff834 SHA-1: d1a0e0e614e6034dfc15b86cb8f3ac32e033718c SHA-256: df4855947fe44b53295745083e3926d1466667eaae3727eca124e684c4f39479
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/aws?keyword=f2+polar+atau+nonpolar In PDF document text
    • https://jawifimubagibe.weebly.com/uploads/1/3/4/3/134310986/4440926.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404103/normal_5f9b95a697da3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375358/normal_5f9676b84b887.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/8965d529-b872-4f82-a4cc-39ea1085401a/chasing_lincolns_killer_john_wilkes_booth_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a0801da-fbb0-455d-a8db-a8af5e34d3e7/nipax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56ffc345-4aba-430e-b7d1-85b6eb34897e/84796514805.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12278f0a-92d6-4727-8365-528d6b859a81/rizonaxinerize.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/2062/6331/files/communication_device_meaning_definition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6766/9654/files/continuous_distribution_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cda0aa5a-4ccd-49c7-9085-997ab71c109d/61283566464.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_off000063eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63EB 4720 bytes
SHA-256: 83302b61ccf6cf2bd0193255212bfc37842ea7e4f6b8c949126b287bfb1621ff
font_01_sfnt_off0000740a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x740A 11036 bytes
SHA-256: e7e3ebb96b1989d8c6a8ddb94c51e7ef3d096e6ea398fd94f74a30fcd2a17635