Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c3ae539336473d…

MALICIOUS

PDF

43.3 KB Created: 2020-10-04 06:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: b5621687223a1fd3cae78ed107f24f88 SHA-1: 59437830699ea4aaf3afd69cd4a410555eba9455 SHA-256: 83c3ae539336473d10811ceef59a660f71bb61a8040fd972401b809f59f0665c
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://ggtraff.ru/strik?keyword=the+fat+resistance+diet+pdf In PDF document text
    • http://files.kairos-engineering.com/uploads/1/3/0/7/130775491/8607870.pdfIn PDF document text
    • http://files.carolynmackwood.com/uploads/1/3/1/3/131384542/bijim.pdfIn PDF document text
    • http://files.follifix.co.uk/uploads/1/3/1/4/131453718/25b564.pdfIn PDF document text
    • http://files.engineercharliezhao.com/uploads/1/3/0/9/130969798/86528dfc2a807a.pdfIn PDF document text
    • http://files.fiats.info/uploads/1/3/1/0/131070207/b873616266f.pdfIn PDF document text
    • http://niluz.marc7travels.com/uploads/1/3/2/6/132681352/pulilug-wazigusowi-zesesovep-tumoruniri.pdfIn PDF document text
    • http://files.gdmartialarts.com/uploads/1/3/0/7/130739779/pivapujosanuresaxe.pdfIn PDF document text
    • http://files.peregrineperformanceproject.org/uploads/1/3/1/1/131164236/3d6000e1e918.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/1/0483/2696/7460/files/3507971437.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5719/3895/files/83117569924.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1188/9573/files/part_5_common_core_practice_lesson_1_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0466/4223/3509/files/sokagezovitudukofutevi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0778/6657/files/dokkan_battle_mod_apk_4.8.5_global.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_off00006cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CDF 5160 bytes
SHA-256: 06cafbe5ddf1267f10a38938921c7159174fd3bdc06d7f95ed9b5f1c488c32f6
font_01_sfnt_off00007e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E68 9984 bytes
SHA-256: fb4ac92794e5c9589f96892de5ac0cf684d99e1889b9f93daa0a6787f7018d57