Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf0c9b51def070c…

MALICIOUS

PDF

42.1 KB Created: 2020-10-02 03:41:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: d57e21ff96bc87d83930ef39cc3fe331 SHA-1: 275efbd20c6ffbeeff606c8dd629404a2f4f39dd SHA-256: caf0c9b51def070c516a59403f7f7e0ca1a15ef931a33a3edd9235a357b6acb9
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=iliade+baricco+pdf In PDF document text
    • http://zuwonibo.creativefooddrive.com/uploads/1/3/0/7/130739919/35844.pdfIn PDF document text
    • http://files.weekly-eats.com/uploads/1/3/1/3/131379035/kenajezam-vivupufi-ritimifox-mawemokupe.pdfIn PDF document text
    • http://files.leadwithlauren.co.uk/uploads/1/3/2/8/132814680/dufufunu_wiresaku_lasanuta.pdfIn PDF document text
    • http://files.tesaarcilla.com/uploads/1/3/1/3/131381722/lozekanetokiwuge.pdfIn PDF document text
    • http://files.contemporaryundercurrent.com/uploads/1/3/1/4/131438211/woguro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e71b6ec8-10c9-4958-9b03-d009506618fc/wanewixarafoxifuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40ecb894-0992-4c23-b30a-cd35835a4cb7/sujezodofiwupawotef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b5c8988-83cb-4a1c-bc19-1abf03cd473f/86511742895.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cee6803-a137-4bbb-9729-acf2739d3044/70503012134.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89f58505-15a8-48a7-a062-dfa0f4e3d70a/depunevotarobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01066cc6-4f71-435f-ac16-3e6c4049a6af/58080342164.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/651101b7-8165-4d81-90d0-49eaa3f3e3a3/gaxeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/347ea7e8-7cbf-4822-90a4-a6b538b07482/binojidupubupofuwerilazas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d45455c9-98f8-4c8a-8df7-51f7a293261f/61280207925.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50a19f8b-111e-4026-b2d3-9abfaab7bfd3/17805076259.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_off00006853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6853 5048 bytes
SHA-256: f4fe3c7331627020a192b97256eea64dc0336fbec63f1aac886631e4652b3457
font_01_sfnt_off00007988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7988 10028 bytes
SHA-256: f60799feb53e313e837585843d13f0cedcef53f902b27ad90c0033019a73ca1b

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