Malicious PDF — malware analysis report

Static analysis result for SHA-256 c313782724dc1e6e…

MALICIOUS

PDF

63.7 KB Created: 2020-10-10 03:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: d4cfc0c265af42817570b5879d0f4966 SHA-1: e45f53b16c608191e988617b3806595b38080533 SHA-256: c313782724dc1e6ebd98c988d5bce5897bbc6c3e538402be77eceb45c6ab7ab6
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=spinosaurus+vs+t+rex+ark In PDF document text
    • https://site-1039644.mozfiles.com/files/1039644/gesetotujigilajefurul.pdfIn PDF document text
    • https://site-1040995.mozfiles.com/files/1040995/49474020514.pdfIn PDF document text
    • https://site-1037189.mozfiles.com/files/1037189/nekorodusezutejudobuzuj.pdfIn PDF document text
    • http://files.eguastella.com/uploads/1/3/1/3/131380308/1fba55bf5b.pdfIn PDF document text
    • http://files.artistkevinbowers.com/uploads/1/3/0/7/130775528/zusifatojivokan-fabobodegeb-zofipaxejubam.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/1/0482/9088/9889/files/64847148479.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9447/8500/files/posing_tips.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4674/7803/files/vanipuzivikawigaditodu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4312/2083/files/compare_and_contrast_essay_outline_example.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4489/5909/files/post_op_transsphenoidal_hypophysectomy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0460/0905/7441/files/royal_marines_fitness_plan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2961/2709/files/futaba_confidant_guide_royal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/0499/7015/files/62877708725.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_off0000bc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4F 5076 bytes
SHA-256: 5bbd9f0bbfedb0704601166eae2b51e0ae273cb5abaa547315f1ed1ecc41ba2b
font_01_sfnt_off0000cdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAB 10660 bytes
SHA-256: 1716aa96a7236bb7feacfa280238fb41dce147ad733a79569d58f8fe3dabce21