Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2771d358ec755f6…

MALICIOUS

PDF

40.0 KB Created: 2020-10-09 11:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: 60578e217a198b5a72896d80804e1cb2 SHA-1: faa8b791a7544e756dff9f90b4df80e0832b041d SHA-256: e2771d358ec755f648590671f0b255948a5e6445ad0ca2159120a0636412fdfe
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=grand+staff+worksheet In PDF document text
    • http://files.cranecrews.com/uploads/1/3/1/8/131871530/posanujowepesodiv.pdfIn PDF document text
    • http://files.ccmasonicdesigns.com/uploads/1/3/1/4/131437515/malipezuvon.pdfIn PDF document text
    • http://files.taralynnmacdougall.com/uploads/1/3/1/6/131637719/tadojewi.pdfIn PDF document text
    • http://files.oetprep.com/uploads/1/3/1/6/131606992/temukupape.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/fa85acf9-98d7-4069-ba60-8d52ed894b6d/18609820300.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32d480f9-39c2-4f73-bbab-57084f5aa620/63745445911.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e1d5e5c-fba6-4076-80b7-cccabe954603/silibajumikabafokifa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/939ff2eb-e497-4611-bcb0-5e199dcf5f70/pokifena.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d12f9409-ae44-4913-b8c8-806e77001e2c/kisofuzojimexukadituwopus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/142b261c-90d0-42d1-a0ab-6b90dadbf828/wovopep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da9b13b4-cd7a-4aa3-861b-23a4e3296f15/sudopimawakeba.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_off00005fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB0 5152 bytes
SHA-256: 61eb2b64c1d98378ffff57d01d897199b4fc31ae264ec2dad19e6ae65186abe4
font_01_sfnt_off00007145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7145 10184 bytes
SHA-256: e29152ecb813ee225a4ff7258457d6bbbb1d94f99bdbd3c6e5b303b2ea539cf0