Malicious PDF — malware analysis report

Static analysis result for SHA-256 c73d6b7d1d4e6aae…

MALICIOUS

PDF

44.1 KB Created: 2020-11-08 06:54:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: e3ef68b02f8a51295f4d5a32dd487f56 SHA-1: 2df9e88942abf3adade1b16aa161e9325cea38ed SHA-256: c73d6b7d1d4e6aae3af420f41032eb13e6d5e9d1b85554178f943662648da8c6
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://traffmen.ru/aws?keyword=model+1030v+rival+food+slicer+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371004/normal_5f8a6c8ad9fa4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369645/normal_5f886d8f400aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379722/normal_5f937fff1adc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373997/normal_5f8f49628c08d.pdfIn PDF document text
    • https://miremewokar.weebly.com/uploads/1/3/0/7/130738658/zanexomeni-vilufudozo-xumepanuvuxodix-nijodebepomut.pdfIn PDF document text
    • https://vewusijonaw.weebly.com/uploads/1/3/4/4/134489037/kawew_zogudoxoja_gijuratok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369768/normal_5f9d322b4e7d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366973/normal_5f87810ab16ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f870b31e8f78.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/40ddfa4d7f4e3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401989/normal_5f9390876c307.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://numuvagun.files.wordpress.com/2020/11/vixonefemawez.pdfIn PDF document text
    • https://bejagidet.files.wordpress.com/2020/11/infinitive_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12386b12-4959-4250-8bcd-43b66be65110/tufujuzuke.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_off000068fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68FE 5592 bytes
SHA-256: e80c31ad6b125281beccb7bfcaee77c0731e6a6609c9b75ed17d1e6328c7b5ff
font_01_sfnt_off00007c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C06 11596 bytes
SHA-256: 44232acd32f677de5dcaf3e02e386c812ada063b23595853133536fdf0506671