Malicious PDF — malware analysis report

Static analysis result for SHA-256 432a39631b7edadb…

MALICIOUS

PDF

34.9 KB Created: 2020-09-30 17:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: f5277d4e56d7d31fd563da413a9ee2f0 SHA-1: e9ae72ab33d7c249026e669ee0b7d54605eab105 SHA-256: 432a39631b7edadba82f047708d682ac585e32e9c0072bdd6ae7133522a63db2
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=certina+ds+podium+manual+pdf In PDF document text
    • http://files.riskescience.com/uploads/1/3/2/7/132710677/598497.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/1/0436/8039/9510/files/sogikovadineda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1322/6139/files/jewellery_catalogue_design.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9853/0201/files/fevumesekutifogamovege.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9822/9915/files/bivekojirokubuzovow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/bootstrap_form_design_w3schools.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/5120/3990/files/mudezitedu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3378/3203/files/call_of_duty_ww2_png.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2857609843.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0198/1339/files/ladajafor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/7215/1714/files/77174930177.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_off00004daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DAF 5092 bytes
SHA-256: 34e401b9f3a8cbd7f3d1b1223320049f13607346637c28983d5000c850ab1000
font_01_sfnt_off00005ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE8 9508 bytes
SHA-256: 15cb5990db765dbe4da2118f36b3c450f8533fa83bc809af9fd51be2832b06ce