Malicious PDF — malware analysis report

Static analysis result for SHA-256 8636adb7a8c0595a…

MALICIOUS

PDF

40.2 KB Created: 2020-10-31 10:17:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 7ad5130afed4ee94bc557aed9b5c005a SHA-1: 680ec84f5aef769fd1ba8d0ff59c7d7585541992 SHA-256: 8636adb7a8c0595a09086a26c191645b5185160b9e4ff039772e2af0b3f68caf
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/aws?keyword=39+clues+book+3+pdf In PDF document text
    • https://fefaxositepimu.weebly.com/uploads/1/3/3/9/133986539/4715335.pdfIn PDF document text
    • https://tuvomirunasoz.weebly.com/uploads/1/3/4/3/134324776/9117963.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/kizerapu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380876/normal_5f91949bb4b85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369907/normal_5f8e26c0bf905.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386851/normal_5f8d5451ed122.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369664/normal_5f9cb42963592.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379217/normal_5f98d293ef259.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/karulubenawope_rodifanabafu_fosaloripejeno.pdfIn PDF document text
    • https://nipaxibovaj.weebly.com/uploads/1/3/1/3/131379211/7341782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379236/normal_5f8a53772e39e.pdfIn PDF document text
    • https://xepajozojiv.weebly.com/uploads/1/3/4/4/134476610/a612979ac7b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384820/normal_5f9216e63914a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_5f9291658dc1f.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00005e8b.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00005e8b.bin)
    • 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 extracted file (font_00_sfnt_off00005e8b.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E8B 5272 bytes
SHA-256: fcef7f45080cf1f2b70075ae78c1fedd044ed642dabbd65390f05f41eeea4a23
font_01_sfnt_off0000708b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x708B 10488 bytes
SHA-256: 42a6fe8b8359647431ce27eddfe27a728260205511eca70d03696c2a1cdb8c85