Malicious PDF — malware analysis report

Static analysis result for SHA-256 474c9cac4243c5b2…

MALICIOUS

PDF

41.8 KB Created: 2020-11-04 11:43:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 873ed4918748aa0aa799521a9951d91e SHA-1: 719a47e0a25471a9c59243a4ae82b700412181bd SHA-256: 474c9cac4243c5b24d43e76a5a870c3ac6b783d0a5b5c606024b5ee65fac87b2
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=linkedin+guide+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417537/normal_5fa15095e043d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374536/normal_5f91fc5c0b9af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408340/normal_5f966407bf0b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391013/normal_5f9c67273d91f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dinisemowoge/gubiroguzidupopavef.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/bullet_requiem_apk_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/7899/9960/files/lego_mars_mission_7694.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/catgut_cromico.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/giwab.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000592d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x592D 4392 bytes
SHA-256: c03f5b8180f57631b97cbd83a4fc9b8a593a4c6808156863699073b17da522f5
font_01_sfnt_off00006825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6825 10760 bytes
SHA-256: 27aa16f8c9eb06ac78fe6fc9f97b8218397e7662b11ed69fb3c59c4949fc909c
font_02_sfnt_off00008cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CC1 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333