Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f18d8387712a27…

MALICIOUS

PDF

39.7 KB Created: 2020-11-01 14:35:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2022-06-20
MD5: f3213f3b940e6e2189ae15033a1c3c4f SHA-1: 83e0bc4b300503855d578eb7b0fd3707e25de52a SHA-256: 51f18d8387712a274463d51f2a7ddc865630bcf32d3704a3f08d42b8c6b3b1c1
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://gettraff.ru/aws?keyword=powder+toy+download+pc In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372707/normal_5f8f62cd4b2b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368991/normal_5f8a1b6754e0d.pdfIn PDF document text
    • https://fanavepuru.weebly.com/uploads/1/3/1/8/131871984/jeganidoguwirinop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387932/normal_5f9c1835602c0.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/1/0501/6286/0197/files/android_programing_software_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6679/2357/files/59587989007.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6639/9647/files/75199528858.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/0100/4199/files/votobumupine.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/numerologia_y_cabala_gratis.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_off00005aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AA1 5084 bytes
SHA-256: 362504956a2aa79a3655ae54957c92ec9f72800e46cc2b3aeebbf892d5faf75e
font_01_sfnt_off00006c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C15 11484 bytes
SHA-256: a5ca072531db7790c27e3a5b6a03cc23f0f04275eccb7a4c187b846479d9e2db