Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea80b5c089485b8…

MALICIOUS

PDF

39.1 KB Created: 2020-10-30 09:14:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-01
MD5: c0d28246f0c39b26415cb9ad4dfef895 SHA-1: 4f4f528d3051200d253c0dbd30893d39679cc6f2 SHA-256: 8ea80b5c089485b88f32e64102760bf108e4a8ffe856d73cbe9e5f98ada84ed6
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/aws?keyword=parts+of+microscope In PDF document text
    • https://tegugozitofo.weebly.com/uploads/1/3/0/8/130874592/876287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369333/normal_5f93245406a50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369930/normal_5f9886b76d5e8.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/5085566.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f8754a566474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387424/normal_5f8ff41792a6b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/bible_quiz_in_telugu_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6304/0408/files/xusewasebogul.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/business_communication_process_product_9th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/6711/1061/files/xegabomesosufavula.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/9712/0676/files/proxy_browser_android_app.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6875/4594/files/bonobos_shirt_fit_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/gabivakesupumonuju.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_off00005cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CDF 5128 bytes
SHA-256: bcbab7bc8894ac1dda94730b7d1cafb726243c4c1a4523a21e094bfd333be205
font_01_sfnt_off00006e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E40 9876 bytes
SHA-256: 7fc682efe375dace6877271e908e0685fd908c6dc75da8b98ce54dca0019fe53