Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9f8e01114783e9…

MALICIOUS

PDF

47.1 KB Created: 2020-10-05 18:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 0bd9251f4de2a966cd20f72aa79ed9d1 SHA-1: 92053f4cd8b862d19dfb672f6a0b39ed7706f745 SHA-256: 7b9f8e01114783e93c5a6a48eceda2a83f66b42f8dc4a33d0cca8308e2af9039
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=una+vida+con+angeles In PDF document text
    • http://files.royboswell.com/uploads/1/3/1/4/131437243/nagiwekime.pdfIn PDF document text
    • http://files.designsbydebllc.com/uploads/1/3/2/6/132695472/8632781.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/94a7d084-5225-4636-acd6-1e94ec7deba5/18518122401.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/940068db-7756-44d0-bd28-07e13b98080f/82163067040.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c204d249-59f5-499f-9859-14ff8088ed0b/galiwofagokatukobedekogu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d8b6b47-2cb7-4c81-a385-71439d7cccad/13230288559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d270da60-00bb-4624-b4e6-cd75b062b6ea/4818990402.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6354/8833/files/laoshan_district_qingdao_china_zip_code.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/0929/7560/files/85794054933.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5624/1557/files/metabolismo_de_carbohidratos_en_rumiantes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8036/5720/files/6646659746.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3397/9811/files/98392043992.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1621/1613/files/scp_secret_laboratory_server_config_file_location.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63CF 5060 bytes
SHA-256: 474160acab50cfa6efb772d3e12a5d58e8976c6c3905c88f1c34108aa8737fac
font_01_sfnt_off0000752a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x752A 11080 bytes
SHA-256: d42658d852a02998a5b088e1a676c2a4bd1acdec36ca06c53aa9c9458636cfd8
font_02_sfnt_off0000993e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x993E 16164 bytes
SHA-256: f469c5aa689aa4c1965481b78cfaebbf1c3ebdad2306c7067134b7b4aaa0addd

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