Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b97d2e1a7963a74…

MALICIOUS

PDF

42.1 KB Created: 2020-09-30 12:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 62ab233c7977fd91a95a4d3ebc3481e2 SHA-1: 3324a99f41dc3033b2174f713753bf324b6d839d SHA-256: 7b97d2e1a7963a74af376bafb43795b07417cecd84b0d77041bf8a56e7e61c4c
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=spoken+english+topics+for+beginners+pdf In PDF document text
    • http://files.redrockpei.com/uploads/1/3/1/1/131163780/e7ecf5.pdfIn PDF document text
    • https://site-1036640.mozfiles.com/files/1036640/gerativejazodosiseta.pdfIn PDF document text
    • https://site-1037268.mozfiles.com/files/1037268/69540739072.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2381/1239/files/54695745818.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/7658/7172/files/83165075621.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3521/4503/files/minecraft_server_properties.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1481/5901/files/10016614213.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4276/7001/files/23249212547.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/9124/1376/files/90334875670.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6572/1503/files/bujerelewofibedoxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0457/3347/8566/files/blank_cornell_notes_template_word.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5912 5300 bytes
SHA-256: e8f96ea636dd9cda17f164a47e72aaf3c24b219f6b3ab947af00e9c1b218b5be
font_01_sfnt_off00006b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B0F 10148 bytes
SHA-256: 835d33e4570c0303b465853e43a366d6fe935b5d3905f870902e39018863533d
font_02_sfnt_off00008da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DA6 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2