Malicious PDF — malware analysis report

Static analysis result for SHA-256 31dd5458825c8b92…

MALICIOUS

PDF

45.1 KB Created: 2020-11-08 06:09:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 62d2f021e6990f7817e747b20d8b27d0 SHA-1: 939a821947c9c3b018d46d446523f8a4523e68fb SHA-256: 31dd5458825c8b92e06c267df948730efab460b430a609ef1e98b3484f4bff26
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffset.ru/aws?keyword=classroom+cheater+unblocked+games+66 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374979/normal_5f8a623155769.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408464/normal_5f98cd0f8c3de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385012/normal_5f95b45449065.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420039/normal_5f9a9df7684bf.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/gajejasa/house_of_night_tempted_download.pdfIn PDF document text
    • https://fovodifikade.files.wordpress.com/2020/11/dabixitugijokomaniberos.pdfIn PDF document text
    • https://lovubigizimu.files.wordpress.com/2020/11/falcon_bms_4.33.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/pipexipi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9557333-c098-4408-a1c1-f39c21b2e890/55778551643.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d57cc059-7c5a-4375-ac4d-cdb80a59ccc8/bufen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/404532d4-b241-4871-a339-e19e00cf94e0/wow_macro_guide_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfd107d5-5132-45a3-8118-ef4d8756a17a/centerburg_high_school.pdfIn PDF document text
    • https://jagulidul.files.wordpress.com/2020/11/xilekuduzisa.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_off00007037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7037 5616 bytes
SHA-256: cdb747a5a3676d3aae8f769635cec109418e8d52e5f93ab7d01c2b0c11f7acbd
font_01_sfnt_off0000831c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x831C 10632 bytes
SHA-256: c9df0a52f4d82cd111e59cf9c82c7a5522c15cbfc97a6f77c6d5ae80083450e4