Malicious PDF — malware analysis report

Static analysis result for SHA-256 da45876c9e72ef88…

MALICIOUS

PDF

55.2 KB Created: 2020-11-04 06:00:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 0bade7198a14776141b449109e1885a0 SHA-1: f34dc27fb500e78e5799e42c43d2b26118cba485 SHA-256: da45876c9e72ef8840446cf7f284a3f327a139f6d34c16696f2266d2a9be66b7
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://ttraff.me/123?keyword=acsm+exercise+physiology+study+guide In PDF document text
    • https://ponixojezunuto.weebly.com/uploads/1/3/0/9/130969897/c982b6db43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444369/normal_5fa224ed65662.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426966/normal_5f9ea47ad3bdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369512/normal_5f92a895d2101.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/zanazanekoxel.pdfIn PDF document text
    • https://kuvanipugeva.weebly.com/uploads/1/3/4/4/134445248/bozun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_5f9761b15c3db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rimepusox/parent_portal_205_rockford_il.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/rebelabizidobe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7271a773-8c34-4a04-b4ae-e1db996d4c77/half_life_problems_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9c82ecd-8241-48b4-8321-94357fce1f6a/geduli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e86e48b-923a-43b6-8e16-e18889cfcc95/sojugexobefipisarosazetan.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_off0000993d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x993D 5436 bytes
SHA-256: f85430d7eb7c82dee69b5aba37086f2ad2eb7b9f453d57846a0d39342761d7b1
font_01_sfnt_off0000ab9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB9F 10672 bytes
SHA-256: 479d15ca18005124e373d03b2eef5010e3f6ee908fa13b052bc8afb17e6fff40