Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e33991da4ab934a…

MALICIOUS

PDF

44.0 KB Created: 2020-10-01 08:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: d5fe1caf631c988e3f9dc795c744ebed SHA-1: f088bd21dc8f5bf09457788f593326910dff417d SHA-256: 7e33991da4ab934aef96f49a6033ab407e130f0bd98eb86bcdeb4ff314dd3820
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/strik?keyword=treatise+cornelius+cardew+pdf In PDF document text
    • https://site-1038980.mozfiles.com/files/1038980/vutigigan.pdfIn PDF document text
    • https://site-1037241.mozfiles.com/files/1037241/74733946579.pdfIn PDF document text
    • https://site-1036818.mozfiles.com/files/1036818/rixejifigukilivilove.pdfIn PDF document text
    • https://site-1036633.mozfiles.com/files/1036633/43033123651.pdfIn PDF document text
    • https://site-1038872.mozfiles.com/files/1038872/73467268303.pdfIn PDF document text
    • http://files.ustbonifacefafs.com/uploads/1/3/1/4/131406505/59c265c00.pdfIn PDF document text
    • http://files.mineindia.com/uploads/1/3/2/6/132695698/e4b74d6ef2.pdfIn PDF document text
    • http://zepovez.valdeckerphotography.com/uploads/1/3/1/8/131856331/togopagi.pdfIn PDF document text
    • http://muziwuni.refugefriendsinc.org/uploads/1/3/1/4/131482976/9e2c9526257f583.pdfIn PDF document text
    • http://files.womenwithapurposemin.com/uploads/1/3/2/6/132681229/foselif_zebuv.pdfIn PDF document text
    • http://files.summitrootsfarm.co/uploads/1/3/1/4/131453543/6806273.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/1/0430/1311/1961/files/85395563634.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2191/0694/files/norebifeneku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9148/3042/files/hewlett_packard_7280.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4646/0840/files/husky_paint_gun_manual.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_off00006f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F2C 5188 bytes
SHA-256: 43fbabf1996805ee84c53c1f7405f9f64c169a4149b883235bbe14cfb88f6f4d
font_01_sfnt_off000080ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80EC 9864 bytes
SHA-256: 12c7150b60624cbfa623403c4a3bf13d3dc4cfb9dda6d9230d4284a964d98d45

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