Malicious PDF — malware analysis report

Static analysis result for SHA-256 623a133c2ca7cab4…

MALICIOUS

PDF

46.0 KB Created: 2020-10-15 14:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 26f4785d6521552055c1cfa0d6c9c2ae SHA-1: e61da5db19429ebe158814f350f1639b27c58efd SHA-256: 623a133c2ca7cab47edd17b582b1f6e9cfbfd4188d223d7954b46fc1f479a66e
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/pify?keyword=dell+latitude+3490+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366014/normal_5f8744fd800fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367922/normal_5f8792c79c2a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_5f86fce226598.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/fbc945f1-7267-4215-9e5e-01d16fac0618/tazezunotakita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b91bf13d-3178-4294-8193-9c7a2632d3c3/29840914830.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/0588/1763/files/pack_and_paddle.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8972/6107/files/nofuwavovamaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8978/0124/files/quantum_glory_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0317/4308/files/the_blue_zones_solution_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8620/7894/files/10768668194.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29462c3d-548e-4592-8551-e654bb848402/25659037886.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eba98166-9ee9-474b-8421-2c3c76736c3e/relep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41c671b8-ea75-47a4-ad4a-cfbe11d85bb6/bajudaboxijar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4098222-8a48-4aea-92fe-8dd576237de9/3467587430.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5004/8921/files/43558576686.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/5463/3638/files/60327963152.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/7153/5774/files/88338413198.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/8432/8344/files/48706674294.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/9639/0814/files/math_worksheets_for_3_5_year_olds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5885a361-5a84-419f-b4e9-c0c615e8f254/32141285008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1bdfbf4-3667-44b5-8653-1cf43ec73f19/40270413093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a796a1d-ab00-4c7a-938f-21fda0a56295/putuviwuke.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_off000075df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75DF 5308 bytes
SHA-256: 97f3d4f477a4adfb10241d80b35538cfcf7254908aad12cd03d9efcf5af127e8
font_01_sfnt_off0000880a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x880A 10252 bytes
SHA-256: 9c5cd4297510a84323e78f0ae12f015e9d3722f3de0f32545a92f997d4b90676

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