Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6fe1da69b50c9c9…

MALICIOUS

PDF

47.2 KB Created: 2020-08-09 19:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 1eeb0ca05c86ef40c449b9e3378b81a9 SHA-1: 6b172fc3ddee64fb33c2518ff732e484b39c40dd SHA-256: a6fe1da69b50c9c990304a3602b9f4df8d6764c6d8746388a44ed51cb4bbd5ca
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://ttraff.cc/pify?keyword=bacteriology+biochemical+tests+pdf In PDF document text
    • http://files.theindoorhockeyleague.com/uploads/1/3/1/1/131164046/6451449.pdfIn PDF document text
    • http://files.comptekcomputers.com/uploads/1/3/1/6/131607053/7246860.pdfIn PDF document text
    • http://files.metersnelectronics.com/uploads/1/3/2/7/132710690/rakudedu-manopazazewe-babafusenawufe-vovetokifilorow.pdfIn PDF document text
    • http://welenawe.ssilandbank.ca/uploads/1/3/1/6/131606289/5888776.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/1/0434/4443/7144/files/7310001987.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5780/6488/files/human_embryo_development_stages.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9911/1070/files/benthic_invertebrates.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2321/9363/files/4439655939.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/9998/5822/files/1999_jeep_cherokee_owners_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7102/0957/files/demebivuwuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6815/4278/files/viguzu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0191/2224/files/fuxigif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0393/5902/files/doxuxufiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2699/5621/files/certificate_of_registration_of_marriage.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3652/2149/files/91652656877.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/39110233940.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2388/2664/files/dapelesapexetodini.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_off000079c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79C1 5860 bytes
SHA-256: 014286be4d96aeefbec2acb7b2f99e4d49ce100629b0f5be1159c0ce34022c68
font_01_sfnt_off00008d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D8C 10060 bytes
SHA-256: 340f93ccce6c2d7688073f5691c692135cddcb542f72525c77a6f8c58905fa8a

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