Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fafb0e05086ed45…

MALICIOUS

PDF

43.8 KB Created: 2020-10-05 14:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 5242057e64372430366e63a2abb3ea57 SHA-1: e7821fdf1a5d68aabb2722a6a99e4fe3e58342d0 SHA-256: 6fafb0e05086ed457ee23b73d571293dbb5d49fd4e1feb5f180912864aca5f59
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=accounting+principles+volume+1+with+wileyplus+edition+7+pdf In PDF document text
    • http://rewip.techbrarians.com/uploads/1/3/1/4/131453109/7774916.pdfIn PDF document text
    • https://site-1041282.mozfiles.com/files/1041282/41730927579.pdfIn PDF document text
    • https://site-1036982.mozfiles.com/files/1036982/jipaxoxiliri.pdfIn PDF document text
    • https://site-1037075.mozfiles.com/files/1037075/73141822832.pdfIn PDF document text
    • https://site-1036996.mozfiles.com/files/1036996/63476662281.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/1/0481/2606/6851/files/lesson_10.5_practice_b_algebra_1_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9125/5713/files/tokapawafajenop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1214/7360/files/edco_la_mesa_customer_service.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/1371/3315/files/conversion_to_non_scalar_type_requested_c.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/kenesazoteparaguwosapapi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c41f6efe-86e5-472f-a140-2ca7cdc069f6/merunakaxelugaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ea9d4e5-038c-4c0a-bba2-8ae64ee145d9/jiberelujaxelidunosulafu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/badc8c61-dab8-44c0-950e-2f14a5d512fe/6553029733.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b409612b-cfaa-40f1-83d3-79943303f2a6/tituzisikafopuzinapuv.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_off000067ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67EC 5732 bytes
SHA-256: afa7ecd1c11a27f7c08abbeb129b7be42aa79ccb0ba9fe995b593f4f65f62a5c
font_01_sfnt_off00007b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B77 10916 bytes
SHA-256: 8cc655d01e6e72c431d0952f518c44a3f97254768094a8f00d841d4226c7b751

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