Malicious PDF — malware analysis report

Static analysis result for SHA-256 de41b6fba3dae538…

MALICIOUS

PDF

62.5 KB Created: 2020-11-01 17:17:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-04-04
MD5: 19bfd6edf763ee7b2102e5c848a7d6c8 SHA-1: 4995efc0b3e6c483df836f74e5545932321b49db SHA-256: de41b6fba3dae53811cd96a2402608db74e58e99ab0b7db35e52897e1b6c2cf6
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/wb?keyword=cnn%2010%20october%2028%202019%20video In PDF document text
    • https://s3.amazonaws.com/damerirazib/49355905022.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409000/normal_5f9e27a6b5610.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367951/normal_5f8c9ba96f193.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376127/normal_5f9564444496a.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/rukubitozarabeposajuxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385231/normal_5f901abdd1dcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378605/normal_5f923ecae2d41.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/ejercicios_de_ingles_present_perfect_just_already_yet.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00008e5a.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00008e5a.bin)
    • http://www.thdl.org/http://www.thdl.org/TibetanIn extracted file (font_01_sfnt_off0000a073.bin)
    • https://cdn.shopify.com/s/files/1/0471/0678/5430/files/gonzales_v._raich.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2574/3521/files/libri_meccanica_quantistica.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_off00008e5a.bin)
    • http://www.gnu.org/licenses/In extracted file (font_01_sfnt_off0000a073.bin)
    • http://www.gnu.org/copyleft/gpl.htmlTibetanIn extracted file (font_01_sfnt_off0000a073.bin)
    • http://dejavu.sourceforge.netIn extracted file (font_03_sfnt_off0000d6b1.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_03_sfnt_off0000d6b1.bin)

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E5A 5292 bytes
SHA-256: 9dc4bebe1942c623b609ccec930971394326ab616e51725c99cf02b2a70fd23e
font_01_sfnt_off0000a073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA073 8904 bytes
SHA-256: b8fc65bbba619135cab7780f9beab6cefe83e63bb006e438305ae7529d8adaf2
font_02_sfnt_off0000b224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB224 10660 bytes
SHA-256: 5483daf29b38211473ff71a64da3b9ab4e6166c09a29d1d1920d87fde5f58be1
font_03_sfnt_off0000d6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B1 16208 bytes
SHA-256: 661ce3b730230e51d93225809bef281b2190efab8c36674060e1757dedbb49f8