Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca9258b3bdc8cd1…

MALICIOUS

PDF

40.2 KB Created: 2020-10-01 06:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 8e243154e1f2713179013ff3ce46cc0e SHA-1: 2ca6f50105023d74c9545d8c7d4d952c009c60e9 SHA-256: dca9258b3bdc8cd1db9b8c16b42fc2501f04c11c40ac5db58bec5a0c4adad0f5
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=utility+function+questions+and+answers+pdf In PDF document text
    • http://files.robinostech.com/uploads/1/3/1/4/131406202/pogeboja.pdfIn PDF document text
    • http://files.rycroftlabradors.com/uploads/1/3/1/4/131437567/909a53d86245.pdfIn PDF document text
    • http://bavuliwo.kingstonwestdental.ca/uploads/1/3/2/3/132303338/fdad2331c2d3.pdfIn PDF document text
    • http://files.tucksofsaugatuck.com/uploads/1/3/1/4/131483348/jisisor.pdfIn PDF document text
    • http://files.antjedormeyer.com/uploads/1/3/0/8/130874305/fifefobenu.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/1/0432/4347/1003/files/58562081662.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/6948/0600/files/breath_of_fire_psp.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7746/8327/files/99325788858.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cc8d5d7-b4b3-4fd6-8e2d-011071414635/tavowivin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83a2c29d-9ab8-4e26-ae76-c1515a205917/91712253912.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcd55efe-24aa-4ad3-806e-dc711f7bd5f0/nadewuvoxetudavu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5313/8591/files/28805223404.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5796/2405/files/nisemosi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/5169/1680/files/3ds_max_tutorials.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5448/1058/files/83410662138.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/7924/9319/files/molar_mass_of_pbno3.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_off00005df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF6 5460 bytes
SHA-256: 8b4def6e75dc44b0af7bba9a066a8c2a149bdc5bb30e153a80898f8d5e39d1d0
font_01_sfnt_off000070ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70BA 10296 bytes
SHA-256: ee52ac4e23839078e4e58d30c426c95d928d46475afa00dc72f011ca4ea6298f

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