Malicious PDF — malware analysis report

Static analysis result for SHA-256 b31ad2891e846880…

MALICIOUS

PDF

40.0 KB Created: 2020-10-01 01:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: 7e00269dce8682996472fd2a0529dcb7 SHA-1: 39230ae2399a50551348ccffe72cf985c2196bfb SHA-256: b31ad2891e84688099213705f5ada1af9f5df8d533de37eed5ff8084d17aac7c
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://gettraff.ru/strik?keyword=causatives+have+and+get+exercises+pdf In PDF document text
    • https://site-1037192.mozfiles.com/files/1037192/18105322604.pdfIn PDF document text
    • https://site-1038600.mozfiles.com/files/1038600/bavuburujepux.pdfIn PDF document text
    • https://site-1036980.mozfiles.com/files/1036980/munefugebu.pdfIn PDF document text
    • https://site-1039133.mozfiles.com/files/1039133/rarudosojabijesesid.pdfIn PDF document text
    • http://ruzono.wealwayswander.com/uploads/1/3/0/9/130969723/madapo_wanadasoloz_wazuzabelo_maruxekevonida.pdfIn PDF document text
    • http://files.janelincove.com/uploads/1/3/2/7/132710783/95cbc1.pdfIn PDF document text
    • http://pulila.newworldparadigms.space/uploads/1/3/1/4/131455734/558155.pdfIn PDF document text
    • http://fuwofanin.limitlesschris.com/uploads/1/3/0/8/130874474/fularetaxitegan.pdfIn PDF document text
    • http://files.iconbiketours.com/uploads/1/3/2/3/132302944/pirujanaxalasem-vugibumev-kibexin-xegamokofen.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/1/0434/6553/9741/files/crioterapia_fisiologia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6341/9814/files/extraneous_solutions_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9272/2339/files/79704219925.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/mr_bean_movie_tamil_hd.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_off00005d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D83 5420 bytes
SHA-256: 746e319c43ad052a1198391cae469d57013e5fbf269343b82b7d3037cef0bed5
font_01_sfnt_off00006ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF6 10316 bytes
SHA-256: a9d6fde278041e3ca8478c5c3984744b60d976594c1a5ae5b843389e176157f2