Malicious PDF — malware analysis report

Static analysis result for SHA-256 57cb0ed6f8ecdd96…

MALICIOUS

PDF

43.5 KB Created: 2020-10-31 12:24:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 13c1065ef6e13aedcb369d07ddabcf75 SHA-1: 43194dbb8bb0cc68e5882c51e60d80afb08d1f77 SHA-256: 57cb0ed6f8ecdd96f13b6935b67cc5d04274919334943479e9e724c0bd86e6ff
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/aws?keyword=constant+k+units In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367019/normal_5f88a46586637.pdfIn PDF document text
    • https://mapipuluzobeb.weebly.com/uploads/1/3/1/3/131398440/2455667.pdfIn PDF document text
    • https://luzodogapop.weebly.com/uploads/1/3/4/2/134265842/1097813.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00006b87.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00006b87.bin)
    • https://cdn.shopify.com/s/files/1/0504/3965/1497/files/vanuguwow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5373/8915/files/xokuvedomi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1060/2661/files/craft_shows_in_jackson_michigan.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/dogijasekinawesabile.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/tubasomizo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa93a9ed-7530-42fb-a3d9-06fd6ae6db34/46336186161.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/26578277203.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/9603/1391/files/misedemitub.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_off00006b87.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B87 4520 bytes
SHA-256: 27d28f33481b8a5e2ad88bbcf43a0726f30a5164ea7f9d1138615a4ec1f75c50
font_01_sfnt_off00007af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF8 11624 bytes
SHA-256: d9a5deb04f4e253bfa02d980b15da6899c248ea7944691b8aeae7c41327d5dd9