Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a243ca4b3085b78…

MALICIOUS

PDF

42.5 KB Created: 2020-10-10 16:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 3f5b5a447cbcac0c53efad11b2b68e01 SHA-1: df3f4d09f9c0c5c6c9b6a2168b5d22ce1eac6680 SHA-256: 5a243ca4b3085b789ff68b995a3f8fea9f7455af78d460ae8e4ebd5d4e8a1134
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/pify?keyword=tia-569-b+en+espa%25C3%25B1ol In PDF document text
    • https://site-1040677.mozfiles.com/files/1040677/58020439875.pdfIn PDF document text
    • https://site-1038494.mozfiles.com/files/1038494/doxovibuzubafejapa.pdfIn PDF document text
    • https://site-1040256.mozfiles.com/files/1040256/83582255033.pdfIn PDF document text
    • https://site-1038299.mozfiles.com/files/1038299/zixejeteremufomopifa.pdfIn PDF document text
    • http://files.cell-tissue.com/uploads/1/3/1/0/131070526/xalikizomasosejabexa.pdfIn PDF document text
    • http://maferixu.alyssafamoso.com/uploads/1/3/2/6/132683051/tewiliditakifubaw.pdfIn PDF document text
    • http://files.workwithelise.com/uploads/1/3/1/6/131606273/9158162.pdfIn PDF document text
    • http://files.brittanypelias.com/uploads/1/3/0/8/130874082/povusufukumifo-pamoziki-jagitetigume-wufow.pdfIn PDF document text
    • https://site-1042740.mozfiles.com/files/1042740/36899458940.pdfIn PDF document text
    • https://site-1038582.mozfiles.com/files/1038582/fasatubirajetuv.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/1/0482/8997/2385/files/jakegokuxedejidewekuro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0138/6920/files/sentence_completion_practice_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9314/0676/files/viking_chicken_stew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/4714/9464/files/christmas_vacation_pajamas_clark.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_off000064f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64F4 5484 bytes
SHA-256: aec6b496d695f8c5c637d412ed772d3d14ec961aa835284c8a503e41f31e4f35
font_01_sfnt_off00007761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7761 11012 bytes
SHA-256: dc6949b34649c5a6e02f33b8decd7a9bb12f4167bea5092decde4d7815f06bd0

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