Malicious PDF — malware analysis report

Static analysis result for SHA-256 af735c6917b2eff9…

MALICIOUS

PDF

41.5 KB Created: 2020-11-01 18:47:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15
MD5: 86503ba4a503ff4d08f7304ff0329658 SHA-1: 9d73eb53fc753ffcc2f013150c18bf936d58dda1 SHA-256: af735c6917b2eff9b36dd82c324d4945284bbc5270dc019913941e202d2bebe3
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/aws?keyword=endless+sleep+song+mp3 In PDF document text
    • https://fidevawane.weebly.com/uploads/1/3/0/8/130814252/fejilar-gomijigujoxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386347/normal_5f955a0da72e1.pdfIn PDF document text
    • https://gorokawuse.weebly.com/uploads/1/3/4/4/134489158/gufinobisukapam_jadiku_kikap.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/jufowokedunod/counselling_process.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/complaint_and_adjustment_letter.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/biblia_de_estudio_ryrie.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/zoology_gk_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/medadele/13688571696.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/schistosoma_spp.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/99202351043.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50c56ab5-966f-4ed4-a958-7c603e97b764/the_atomic_mass_of_candium_activity_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/warujubilaximuvol.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/charismatic_leadership.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_off000063b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63B3 5092 bytes
SHA-256: fde95f0c793e26bbbd4b551a0311dac04bab33acb5581d42e0daea5cd9da35be
font_01_sfnt_off00007502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7502 10612 bytes
SHA-256: 74e5144341cf3c0605f43adbcbb9e794a74349eaaf1c2e6ef51e0eb0c6488007