Malicious PDF — malware analysis report

Static analysis result for SHA-256 20def41537da5fea…

MALICIOUS

PDF

42.4 KB Created: 2020-10-02 08:40:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: c15b5da5d8775cb03b3a7fa956cb36bc SHA-1: 214dc9ef8bcffd0fde01f78a54a6491c3b84e07b SHA-256: 20def41537da5fea4323943cfb7c24fd5bf9b6b448f0632d1e52c462f7f056f0
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/strik?keyword=actividades+con+la+letra+p In PDF document text
    • https://site-1038892.mozfiles.com/files/1038892/47380544249.pdfIn PDF document text
    • https://site-1037241.mozfiles.com/files/1037241/komax.pdfIn PDF document text
    • https://site-1037224.mozfiles.com/files/1037224/94198895935.pdfIn PDF document text
    • http://fapefe.warmanddryuk.com/uploads/1/3/1/4/131453358/3598969.pdfIn PDF document text
    • http://nevule.kitzanfamilyfarms.com/uploads/1/3/1/1/131164021/birozubolowamu_tisevapo_fogamumepug.pdfIn PDF document text
    • http://files.vinublog.com/uploads/1/3/0/7/130740323/ad4273654227740.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/61d3f3c9-f0a9-4f61-9677-0e18458e1fb1/63052454123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9ebadf1-3ecd-47f4-87c8-a5f548b99a67/tuwirobenufom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dba541ad-5678-4b8f-b80a-4656e93aa326/20002957407.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec684470-04d6-43ee-bfec-94cbbce74954/murojezuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9b99a9c-c3e0-4c83-8380-6e0ba251ce3d/49646209686.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c68c966-422d-4b93-9fd4-24ff0016b3b7/29879749276.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e24b64c-3ec8-4ada-88d8-2730cbd646fb/54237944491.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a13f2087-8c37-4aaa-a7dd-3988d854a90b/48791783901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9655d929-7273-4d6a-9283-c90646033c3e/85880345243.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_off000065a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65A3 5116 bytes
SHA-256: 6cb2681c6729ee2c94518bb2bfca55c73d22438cd37b4a4a952c1b598bceb2a4
font_01_sfnt_off0000771e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x771E 11032 bytes
SHA-256: e5d79b313716587cfa273c2c28080b650bd3174ace864fb93187aa2b052925e6

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