Malicious PDF — malware analysis report

Static analysis result for SHA-256 9824311ff3e33506…

MALICIOUS

PDF

43.9 KB Created: 2020-10-27 18:57:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 9650ed6783c732319d3985aec7628fde SHA-1: 0171e2bc9c7884d04ee4807d53458b18907a2582 SHA-256: 9824311ff3e335060dec97dde2da609024377dc80110ca4b3c8e8518dbe437b0
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=marc+brunswick+line+schedule+2019 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366959/normal_5f8a27da2aa66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386621/normal_5f8eba3adf8c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405181/normal_5f9645f8c5a57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402940/normal_5f95e876228e0.pdfIn PDF document text
    • https://tedovuja.weebly.com/uploads/1/3/4/4/134465286/317970.pdfIn PDF document text
    • https://moxipilewuzeget.weebly.com/uploads/1/3/4/3/134360433/5153363.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00006729.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00006729.bin)
    • https://s3.amazonaws.com/bepukuba/paramphistomum_en_bovinos.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/classroom_application.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/amaranthus_albus.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/icao_annex_12_download.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/boneshaker_cherie_priest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d82a81ad-5dd8-4482-9eff-b8d15c283807/voxabeze.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/sezugiguji.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/kizosexov.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/pizutelot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/0019/6002/files/81936761964.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/3785/0262/files/kundli_software_apk_file.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 extracted file (font_00_sfnt_off00006729.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6729 5812 bytes
SHA-256: 265543c69563d94ef62c6ee60e0a86841b95e2834a8aa6fda6a9fd708e87f884
font_01_sfnt_off00007afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AFA 11756 bytes
SHA-256: a94f4062aa1842105d7547d672c14beb6bd881c2e84a3f1755572aff8bb6cce0