Malicious PDF — malware analysis report

Static analysis result for SHA-256 4492ca989fd3275d…

MALICIOUS

PDF

41.1 KB Created: 2020-09-30 08:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: ef8e3e1c443d36e59f4c6b940e852948 SHA-1: eabb5803c970e71e8f6b7065fd723777f1426157 SHA-256: 4492ca989fd3275dedce1c3e59e61d2a0eb571d770df498ef381be164ae6e534
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://ggtraff.ru/strik?keyword=chaconne+violin+bach+pdf In PDF document text
    • http://files.janebrockman.com/uploads/1/3/0/7/130776058/2dffc7d.pdfIn PDF document text
    • http://vegufiw.avalonhalethomson.com/uploads/1/3/0/8/130814328/9305104.pdfIn PDF document text
    • http://files.jurassicriders.com/uploads/1/3/1/4/131406999/9161794.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/9495b9bd-bbbf-4bfd-b990-61e6970ff566/paxuxovavezuzadat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a78f89c8-3169-4f5b-a721-5e18ecf146ab/tabukusulikorapilom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2fcdda1-3c79-43b4-ba6d-4e08d6515bcc/bosafafojefodiwukaboxod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a49cdb45-c228-444a-b986-033c95f82c59/92159687948.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3629/5836/files/lakshmi_stotram.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2820/0096/files/initiating_coverage_report_thomson_one.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0451/9297/0389/files/furalufifev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/82595467958.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7465/8197/files/81541599816.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7909/6728/files/59093178109.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1515/9458/files/zozubavafikalutiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7853/2774/files/83982494489.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3511/5175/files/48309194832.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_off00006442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6442 5076 bytes
SHA-256: 029647bac60aadf2e1a79dda89514fd4a8a4028705127829befc0f06282efaae
font_01_sfnt_off00007585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7585 10040 bytes
SHA-256: 9cb1ff687163ff3ba2c7bd7c1928220108aba76f71aae0ddca7f56645ff0a56e

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