Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4d73569924c3a7…

MALICIOUS

PDF

49.3 KB Created: 2020-10-02 22:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: fcab429b2bd4ceb548f7994f3f3af4a4 SHA-1: 20a48e358c6f157990b5d5a8c05bfc6b6c99aa33 SHA-256: ca4d73569924c3a76947e05ea97253fe18d030d79367f1cb1d61dcc6f43c7812
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=biografia+de+simon+bolivar+pdf In PDF document text
    • http://files.ericphotography.net/uploads/1/3/0/8/130814208/kusefunetuf.pdfIn PDF document text
    • http://files.biglevel.net/uploads/1/3/2/8/132815206/851383.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/e32a1d03-8e56-46de-ac11-3e96165fb435/63022817331.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2906d18b-3a84-474e-8f4e-c0b65c59be07/68691972381.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3811a827-2970-4baf-a133-2b447fa977cd/915991659.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e260fbc-a5eb-4744-bfaf-9ce31cb0cf78/janomufagozeguxumejoturi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a590d08-e9bd-4f9e-b76c-da3c16864cfe/numagetatakoxusimi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d2a93e5-806c-4dd5-a3af-53adeb0a6e4a/13634969232.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bda1abfd-4b94-4415-97cf-8aa97a6bd502/74496714335.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/248206c7-ac23-4cd1-8159-2edaae6f051b/zaxuvoborizizibavigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13cb92bc-36b1-4004-a615-02728821493b/rezanelufesovokebizu.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_off000083b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83B3 5608 bytes
SHA-256: b27622beed7c2ce608a47e6bcef70a49140acd23bdd320deffebf8c33fe672bf
font_01_sfnt_off000096bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96BC 10100 bytes
SHA-256: bb416f7e1ff6893f0fe4d98861f94efa7a269a123f2947ee34ac3c003c1eb513

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