Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2e19082e111d2af…

MALICIOUS

PDF

40.7 KB Created: 2020-11-03 19:44:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: d1404750de3282ac45fc7f2ba0dfe842 SHA-1: ca0762bf63ac328023b5bb8b1078c0c86b36e25d SHA-256: c2e19082e111d2afd8472d6d9fbbadd5cbba52eb493994b7034bdb3dd22987c0
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=accuplacer+math+study+guide+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381762/normal_5f957a1daadff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371244/normal_5f9a99338b0bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408460/normal_5f95ad8c11cb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_5f99e1c278882.pdfIn PDF document text
    • https://mevamakokuvafas.weebly.com/uploads/1/3/4/0/134040887/2042642.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387031/normal_5f8fdd5247a2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366371/normal_5f8f2e3a8b3ff.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/winepogor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373768/normal_5f9d78a40b5d1.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/suzeduselu/24_ft_ladder_rental.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/40430042650.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/kivuworizi.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_off00005f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F7B 5660 bytes
SHA-256: 2fc468f8f489ef038433d6ee3a9da909aea22814ade851d082378d8b72eddaaf
font_01_sfnt_off0000729d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x729D 10528 bytes
SHA-256: a4198033da347c9498ad63929aac336f6702383e4234eea7d304652e504debf2