Malicious PDF — malware analysis report

Static analysis result for SHA-256 c40d0e979076a507…

MALICIOUS

PDF

40.0 KB Created: 2020-10-07 16:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: f852c793118237ed8a7557e7f283f823 SHA-1: 721a83e29a038105b05c9e1b188885fff9d95222 SHA-256: c40d0e979076a50765e9d5387a96d5b9b14c1dbbe77b57f26d984b90d51def2d
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://ggtraff.ru/strik?keyword=present+continuous+passive+voice In PDF document text
    • http://zemiwus.gemwomen.org/uploads/1/3/1/8/131856772/wafipeja_romejadoxe_pivatamebagog_dejatekinazusu.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/d174183b-8b19-45bb-8aaf-99aeb3360d7c/15007886377.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8628263d-7798-438e-95ba-8f3f486b2d04/gunebijapifafejunokujasat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5545838-264d-4d17-8a22-6d57d336842f/xeronoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbcbee83-2112-4f76-913e-a1697c135b31/79242388389.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/0418/5752/files/gestational_diabetes_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0468/0119/1063/files/mincha_service_english_and_hebrew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2071/4137/files/sides_of_a_30-60-90_degree_triangle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5afb3e62-a665-4d47-9710-b57ce304c4d0/gesixevamedamifojuxog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2146c9e3-b066-41db-b467-c81de51b23a3/kuzamexolidikovad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/286bb3da-1eb6-4698-a12a-1ee7a0cce08a/zonasagumoza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffd98dbc-5a2a-41b5-976a-6034db8e9959/muvaguxirebakowirab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a22b7021-a792-4799-81a8-ce1d40cb983b/20724036219.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_off00005d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D14 4956 bytes
SHA-256: 5dea014c6dbab522cf113a6e2671c02fb4a7c18097f737fc836bcb1c2d1d5a52
font_01_sfnt_off00006e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E07 10580 bytes
SHA-256: d0e28fbd67868d09bef4d57a0efa8534d672f27766227d6ea0a538cee9de7d3a

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