Malicious PDF — malware analysis report

Static analysis result for SHA-256 b24a786d04d59c77…

MALICIOUS

PDF

52.9 KB Created: 2020-11-06 00:36:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: a3d0cc5cd0a5b5f0784464e3620ecacc SHA-1: 5c01cedcfa09ff2435ab73ea5bd4435d1b0dc71f SHA-256: b24a786d04d59c77b5253590171f39c2236c9fdb4ecb0799284493b2c7d1cff2
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://traffking.ru/aws?keyword=linear+programming+ppt In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403121/normal_5f9239c4daaa0.pdfIn PDF document text
    • https://kisogegexene.weebly.com/uploads/1/3/4/3/134374262/3540919.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366989/normal_5f8cf6c36488d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_5f941c76e68ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367944/normal_5f9715d3cc4aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423427/normal_5fa38d2095bc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404964/normal_5f9287f04b459.pdfIn PDF document text
    • https://wajogivetiwi.weebly.com/uploads/1/3/4/3/134322864/4237705.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384633/normal_5fa4480e3f48a.pdfIn PDF document text
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/xaselesimixo_zupowojif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_5f9291e46cdb0.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/sasufufa/puvixaselovajojuwozafot.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D10 1528 bytes
SHA-256: 68fc7b7a748f9af9722f74a362c3a817ea7369da6592dbd58f25ca1265c98c1b
font_01_sfnt_off000084da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84DA 4656 bytes
SHA-256: 3a478c7641ea1f37732c41ebee7434d361c91b06af59b0e23cc5fc76a4eda8d3
font_02_sfnt_off0000948c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x948C 10612 bytes
SHA-256: f268e93eb63888de65abfc7d632d675b4d6de080470752d067f7ccea3fc0d99c
font_03_sfnt_off0000b8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B5 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378