Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc3cf3513fcd4282…

MALICIOUS

PDF

39.7 KB Created: 2020-10-09 09:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 4eaea6521eb384d7a66889d07ae94fc0 SHA-1: 775989b9bf8a3c9075201db8111c224d445b82ff SHA-256: bc3cf3513fcd4282049d4115ca40cf8b96a8679ec21843510be1edaa24a21228
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.link/pify?keyword=asu+wifi+android+domain In PDF document text
    • http://files.evandusenportfolio.com/uploads/1/3/1/4/131437633/gowidogudewofu-lodufesuzugip-gexevi-kakusokitikej.pdfIn PDF document text
    • http://files.larryssportsexchange.com/uploads/1/3/0/8/130874128/folerezome.pdfIn PDF document text
    • https://site-1040398.mozfiles.com/files/1040398/napisaliluta.pdfIn PDF document text
    • https://site-1041074.mozfiles.com/files/1041074/jebanifefijizotizilajefak.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/b1a8c010-8b7d-4a8f-aa79-d2d57960a73b/kapojole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ca23bef-4b66-4dcd-86bd-935ac940d8bf/8830057689.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7d67459-9144-43bc-8ae3-caa5ae76254d/jilep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72e5e763-bee6-4abd-b266-d536ee119420/jojedakimivexejido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50deafe6-8b08-4401-bef6-77d3aad21224/60393903556.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41aa6161-85b2-4728-867d-fc9a3bec4dae/92576600479.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/125d834c-1b75-4a00-9a2e-c4ea870bc137/69502196035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87195048-043b-4786-850d-500590a938aa/75601493200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ddb7756-b076-4051-8c66-bba51fc38844/93163493992.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_off00005e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E9F 5100 bytes
SHA-256: 1e35b91a669c700c6c7cb2bf242a7eb603f2706d54fbda4079d64e2d8c249543
font_01_sfnt_off00006ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FFB 10072 bytes
SHA-256: 8843d07edc304675f079d14add6a79dae675f461860ef897490d470cafe9dc87

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