Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff0b6fcce031f76…

MALICIOUS

PDF

34.3 KB Created: 2020-10-03 02:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 2165523561216a2a28d848be5f0651ee SHA-1: bebaf9c95935af333c02fb3c3cff9b9e4126d613 SHA-256: bff0b6fcce031f76086fa670f43334777e3ce3e8ba871a21e9a7a787a0c06a8c
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/strik?keyword=months+of+the+year+chart+pdf In PDF document text
    • http://files.rusticcountrycollections.com/uploads/1/3/0/7/130776022/96ee54611395f.pdfIn PDF document text
    • http://files.phsofnew.com/uploads/1/3/1/3/131379181/1215129.pdfIn PDF document text
    • http://files.mycryosculpt.com/uploads/1/3/0/8/130874183/3846527.pdfIn PDF document text
    • http://files.battsfamilypractitioners.com/uploads/1/3/0/9/130969553/favazakopizafaguku.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/1/0485/9566/5056/files/sandbox_flash_games_unblocked.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0623/8613/files/1040_form_2020_how_to_fill_out.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/5286/4166/files/11574733224.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8767/6063/files/80560583654.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0885/1098/files/mosadisogo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8572/5857/files/honey_bee_anatomy_drawing.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_off0000497e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x497E 5316 bytes
SHA-256: a15f78a7df4ba042677f5f5c609f6eec113bcebf5bdb6b95d964dff25d45eee8
font_01_sfnt_off00005ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BA3 9764 bytes
SHA-256: bd4470a93a56ea64a146fc195b4f95d8420b79956b1534b0b6f9f4460067caf7