Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3717ba3d57424e…

MALICIOUS

PDF

41.8 KB Created: 2020-10-09 18:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: f39318806648f73f6bf4fe8072bd591e SHA-1: 34630ef94508139f647ceb25f4c8c047677a6c49 SHA-256: 4c3717ba3d57424eaac3f689a163728ecfe4be0b7ff79827641f983bbfd65219
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://ggtraff.ru/strik?keyword=density+and+significant+homework In PDF document text
    • http://kipipad.lisalenarz.com/uploads/1/3/2/6/132681426/4ba2a.pdfIn PDF document text
    • http://luwozuvej.martialartforeternity.com/uploads/1/3/2/6/132696465/8855867.pdfIn PDF document text
    • http://files.laviproject.org/uploads/1/3/1/4/131453399/bitiliz.pdfIn PDF document text
    • https://site-1044473.mozfiles.com/files/1044473/gabipom.pdfIn PDF document text
    • https://site-1043455.mozfiles.com/files/1043455/75784249051.pdfIn PDF document text
    • https://site-1037124.mozfiles.com/files/1037124/ruzuko.pdfIn PDF document text
    • https://site-1036724.mozfiles.com/files/1036724/wiwutu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/0380/1510/files/weber_genesis_ep-310_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/1041/2703/files/partes_de_un_termino_algebraica.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3469/8147/files/16251547099.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3595/7147/files/14375057964.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/8611/9580/files/longitudinal_and_transverse_waves_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1570/6523/files/lulaxuxikejuvaxilenis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/1118/0197/files/wubop.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_off0000622e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x622E 5660 bytes
SHA-256: 4f071052f805e0cb6473b25a43c2f22122ecc341b0b5137b7069d70fe3226f87
font_01_sfnt_off00007564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7564 10712 bytes
SHA-256: 246ea4a10852895ec20f3da03744b7efa42e6ff5b2de00cd82649191903a864c