Malicious PDF — malware analysis report

Static analysis result for SHA-256 50cb493c2dfb31fa…

MALICIOUS

PDF

44.4 KB Created: 2020-10-14 19:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: ef29f6f307c405ef2faea24a61a1d54e SHA-1: 8c38685cecb23aa14f585ff00fe8a804c3de10f3 SHA-256: 50cb493c2dfb31fafeb699c7c8b9c2ec0bf04bb8759715a5241a035e9903a2a1
184 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/pify?keyword=nice+guidelines+ischaemic+foot In PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/8767144.pdfIn PDF document text
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/ec5bf50.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/fibaxizimudez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_5f87157dccff5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f8706a228e8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366011/normal_5f8708a28c963.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366325/normal_5f872793ccb5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365567/normal_5f86fe96f151c.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/8448799.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/17d0ebd6de52.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/bamudepekepa_setumazowido.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/gapovowumepekegosiza.pdfIn PDF document text
    • https://site-1040400.mozfiles.com/files/1040400/75413640552.pdfIn PDF document text
    • https://site-1037022.mozfiles.com/files/1037022/vusegopawimexonolanowu.pdfIn PDF document text
    • https://site-1038765.mozfiles.com/files/1038765/wugufivemexasiji.pdfIn PDF document text
    • https://site-1048244.mozfiles.com/files/1048244/pumuxabaputax.pdfIn PDF document text
    • https://site-1043884.mozfiles.com/files/1043884/fotinuf.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/96fdaa86-176b-440e-b330-c30724aabcda/volukozalavos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2df9a29e-5b7f-4813-879c-262f5a334491/6718935486.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd1a806a-1b9e-4c83-9de5-e5766802dc47/45735660162.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_off00006fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FCC 5308 bytes
SHA-256: f65782cded61c67ecff1d2fc682bb1a5153951fd7e55d6776f911e196d77ae6e
font_01_sfnt_off000081b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81B5 10352 bytes
SHA-256: e80a7aea2ae8943f56ef03cc1445e748b21bca6ab8d352730a4b0fa27fcb5227

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