Malicious PDF — malware analysis report

Static analysis result for SHA-256 93191dfcf994a115…

MALICIOUS

PDF

42.6 KB Created: 2020-10-06 14:40:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 0fbe7b0712105e7ac760003bc43c6541 SHA-1: 08e828e92fbbc93c9a05b275a0618983b88bcdf5 SHA-256: 93191dfcf994a11509997093fa1b377c738d8543bc6b00a76b2799a42505a4c4
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=emulsion+polymerization+of+styrene+l In PDF document text
    • http://jaxonoke.nateveorganic.com/uploads/1/3/1/3/131379866/xunip.pdfIn PDF document text
    • http://files.frontierwestmontana.com/uploads/1/3/1/6/131636727/tudojafixi_xexokigokatab.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/1/0485/1158/2370/files/91958579028.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2184/6688/files/futib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/0038/4669/files/posurumukaratiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6268/8918/files/salebipuwoduwapalopet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1322/4094/files/braun_series_5_replacement_head_52b.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2862/9662/files/pejaxisipokijukop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8788/8535/files/guide_gear_tree_stands.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5791/3762/files/sebegipomizeti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/3211/7916/files/c_for_scientists_and_engineers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/489e88f1-5a01-4b31-8ae4-477c679d3eba/14056298463.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c83ab75-b53a-444c-9633-b43bc6550685/47612137343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9c5398f-ce0a-49f9-abd1-2cac80878a22/kukurededomifederababe.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_off00006997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6997 5156 bytes
SHA-256: 8687d5e8619cf3602a193055b637b5a6511f2ebe26bee176291931fd868fb22e
font_01_sfnt_off00007b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B1E 10144 bytes
SHA-256: 171c351b3261d88a4d6b9a82bdb80b730b9dceb86e3293a070ff299bac55dfa5

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