Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0fb26a7b7d30c2d…

MALICIOUS

PDF

50.5 KB Created: 2020-08-28 07:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 059700b01dc2342c7cbfb23bacadc714 SHA-1: d414cecc3f128697e9ef6004011634ad94e649e6 SHA-256: c0fb26a7b7d30c2da6be27d027a4f1ed805c689a372680e17f6312c55da8a241
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.club/pify?keyword=uworld+self+assessment+step+1+percentage In PDF document text
    • http://files.theloosethreadsquilters.org/uploads/1/3/1/4/131452997/sumikul.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/1/0431/2511/2994/files/cracker_barrel_triangle_game.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4434/6792/files/zozanulufotefita.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/3439/0178/files/zadoxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8489/0790/files/treatment_low_back_pain.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2381/9164/files/career_paths_in_psychology_robert_sternberg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6953/7432/files/jipasufezuzi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2413/7890/files/xafijifamaromolewasevi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8154/7424/files/zumdahl_chemistry.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1762/3957/files/gerard_de_ridefort.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nejoxalivivurotuzepebibus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4432/2978/files/49988046078.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_off00007f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F07 5612 bytes
SHA-256: da0540e62cf4aa369734ff74c6e58644303c44474b5cc570f4f183d54639eb10
font_01_sfnt_off00009224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9224 13336 bytes
SHA-256: 53c1cff59e1801d6b986084b622260f38ac6d99ff2d4b11735b99c92f810c639