Malicious PDF — malware analysis report

Static analysis result for SHA-256 1119555f484db6c9…

MALICIOUS

PDF

44.9 KB Created: 2020-10-02 10:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: d8bb4c8190b7bc8e09ed9f47fbe311f0 SHA-1: b910423c84310011b81443fe9efa48d3d5184bac SHA-256: 1119555f484db6c919d75ba5526c116249609a9919af1febc43a568188a0fd16
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=atlas+ti+descargar+gratis+espa%25C3%25B1ol In PDF document text
    • http://files.nathanwilks.com/uploads/1/3/1/4/131406234/2642972.pdfIn PDF document text
    • http://vowum.caseycollegeofdermaltherapy.com/uploads/1/3/2/3/132302894/a0bf2.pdfIn PDF document text
    • http://files.shoefactoryzone.com/uploads/1/3/2/7/132712150/9780409.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1207/7206/files/sodofekofo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/8802/7304/files/nuzenamozivunupiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/3226/6920/files/casio_fx-115es_plus_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e8cb04c-65c2-45ee-b754-e310764a6d09/kuvumetupumogeregamopi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ec330b9-4af6-4f56-afb3-b2b68f56f927/risusimivasikuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97d92069-3e4b-4b51-92cb-c06637a83442/98933319661.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52ea06aa-9e08-4993-a07b-cce964956cd9/xugej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7897/5639/files/pupazevutogaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9544/8999/files/physics_data_booklet_annotated.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_off00006e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E00 5440 bytes
SHA-256: c750579632c6cf3ba18be7eda7791d6c2d491d0e7ce5114370fabb708ba264f5
font_01_sfnt_off00008050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8050 11048 bytes
SHA-256: 76ac6a497f4774d4b2dabfb944d0b5999347280fee22d4054f69ee36f59ff95d