Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c16a2e052221bc…

MALICIOUS

PDF

40.2 KB Created: 2020-10-13 07:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: c6214396248cf46bbfed78d01e3806b2 SHA-1: e61b33e82f296bfc5ad2bf08966364d22d45d5bb SHA-256: 26c16a2e052221bc8648f9aab6dd9c25b659f3225478f125195a4055df5270c8
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=my+way+ukulele+chords+pdf In PDF document text
    • http://files.swgrcplanning.org/uploads/1/3/1/6/131636814/1691447.pdfIn PDF document text
    • http://ninefenu.osolnikmachinery.com/uploads/1/3/1/3/131398157/4abe327.pdfIn PDF document text
    • http://files.forensicarts.org/uploads/1/3/0/7/130738554/nijesi.pdfIn PDF document text
    • http://xukiwas.cwaltersphotography.com/uploads/1/3/0/9/130968921/benumozakatigu-vofapezix-xabezeg.pdfIn PDF document text
    • http://bepix.decoratorsbramhall.co.uk/uploads/1/3/0/7/130739919/1468263.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/496637e3-0f9a-4eca-8dd2-c0dee5186321/52603445608.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88ba3aff-42be-4272-9843-76ebb90fe7e5/jijeve.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0469/0069/files/cjs_on_the_bay.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4484/8295/files/pumadanilita.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8489/7701/files/case_study_1_ups_competes_globally_with_information_technology.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2423/8757/files/atomic_structure_worksheet_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4712/4135/files/amazon_kindle_apk_for_android_2.3.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_off0000552c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x552C 5508 bytes
SHA-256: 90697cbaefe5fefe3c9672920b1ba6b8056bc35afe6594bb8ef403247886c4d8
font_01_sfnt_off000067fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67FC 14064 bytes
SHA-256: 91be2cb7eb2bcd9748b1555430f87b3a5e071bb8fa3b11592b3dc0d226391709