Malicious PDF — malware analysis report

Static analysis result for SHA-256 258c715553b27bf9…

MALICIOUS

PDF

41.8 KB Created: 2020-09-30 02:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-07-12
MD5: 74af883ad3e48875290c526a1b3d5165 SHA-1: 010cbef115ab57f9cf46d27b9131ed2387e5833b SHA-256: 258c715553b27bf93b70ad424809fb74d28719413ff3e06b214f79734f7e0d29
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://cctraff.ru/strik?keyword=achilles+tendonitis+physical+therapy+pdf In PDF document text
    • https://site-1037224.mozfiles.com/files/1037224/54392528456.pdfIn PDF document text
    • https://site-1036880.mozfiles.com/files/1036880/fanuwaxegu.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off000064e8.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off000064e8.bin)
    • https://uploads.strikinglycdn.com/files/022ba1dc-09ae-4fa3-ba95-37e787426986/40633875777.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4daef8cc-b9ec-4be0-89e2-5fbd1f1f1cc8/10003171389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea2e5f29-a205-4f5d-98a1-2cab8dfae8ae/zisovukebatenogamomik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/467e31ff-38e4-43f1-af35-f82f5ac83273/7932894707.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0097/8853/files/77880270929.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/2886/1087/files/biology_now_core_edition_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6811/9453/files/kubomusawekexibodo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7935/9900/files/but_how_do_it_know_book_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/4435/9322/files/3347392706.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 extracted file (font_00_sfnt_off000064e8.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64E8 5336 bytes
SHA-256: 61bdb4f718a06981c662798d07d2849f9e9fd39aace87f6e5818cb0a8471ba9a
font_01_sfnt_off00007712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7712 10544 bytes
SHA-256: a859ac894515635df2c01c89a2289d4fe53a6e693e3da28334b195b660af7752