Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a3130fe1ba8334…

MALICIOUS

PDF

41.4 KB Created: 2020-11-05 23:49:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 10b9d56e669cedfbaa038f1ef0411d45 SHA-1: 3ff5d651e75d289fa8ce862146cecc9a99e568fb SHA-256: 42a3130fe1ba8334f1d48f72fe1167265a373d27ede02aa7f823710639e31f93
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://traffking.ru/123?keyword=the+coldest+city+comic In PDF document text
    • https://cdn-cms.f-static.net/uploads/4415531/normal_5f985dbfa1a19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379035/normal_5f93a916d00f5.pdfIn PDF document text
    • https://zuvubexusemeto.weebly.com/uploads/1/3/4/3/134373725/bc9279c49dbdc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393635/normal_5f950546edc5d.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/7569784a-ebab-4ce6-86b2-2ba2f5e976a6/epidemic_music_miami.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d61d78ca-3104-425b-9f88-79dbd1c3c211/psicologia_y_seduccion_el_violinista.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac5bae76-4233-4d32-a4e5-05b932b9b5ae/best_hammer_build_mhw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6104df1c-0fcd-448f-8439-9e8370ef12f3/simed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b753ab7-fc57-432d-bec8-1b38e7f66666/warframe_next_prime_vaulting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/074401b5-77d2-4a4e-a95c-558701c1e7c1/garmin_montana_650t_usb_cable.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_off0000636b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x636B 4924 bytes
SHA-256: 4da3c6d493098a4c2fe5516976762271c371d92c749222ac075c3bfd40f90390
font_01_sfnt_off0000740e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x740E 10872 bytes
SHA-256: 0cfeff8fa3730b3aa962754d8c16e48942c0738d8efc19b2047a488cd848b6e9