Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0caed323f1f7c6…

MALICIOUS

PDF

44.3 KB Created: 2020-08-12 04:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80000240e2daca365e9cac4f71fd74e0 SHA-1: 07fcee96f44e3dda2b47498c6379f7b512fd5ce0 SHA-256: 5f0caed323f1f7c68e7743f4c66aff646c4e6360778b8d4d8aa5295092943722
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm for SEO manipulation or to host malicious content. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.cc', which is used to obscure the final destination. The document body, though partially corrupted, contains text related to a guitar lesson book and the malicious URL, indicating a lure to trick users into clicking the link. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://ttraff.cc/pify?keyword=gibson+learn+and+master+guitar+lesson+book+pdf+free+download
    • http://files.guadalupeblinds.com/uploads/1/3/0/7/130775950/lonipapipedu.pdf
    • http://jozot.bebebreaphotography.com/uploads/1/3/2/6/132681946/5009740.pdf
    • http://gijaz.silvertonmanorapartments.com/uploads/1/3/0/7/130739860/5676147.pdf
    • http://files.degraaffdesign.com/uploads/1/3/2/7/132712129/rupufuk-wobaxiwi-nirosuvuzugik.pdf
    • http://files.karaikudivoyage.us/uploads/1/3/1/4/131453485/6635c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9212/3560/files/piriletinexatadorekuguf.pdf
    • https://cdn.shopify.com/s/files/1/0433/8650/3326/files/8262288843.pdf
    • https://cdn.shopify.com/s/files/1/0450/0701/1998/files/uncommon_valor_cast.pdf
    • https://cdn.shopify.com/s/files/1/0432/8233/3856/files/sovusogepimuwiridabina.pdf
    • https://cdn.shopify.com/s/files/1/0432/6467/1909/files/21001100814.pdf
    • https://cdn.shopify.com/s/files/1/0434/3506/5505/files/11529735382.pdf
    • https://cdn.shopify.com/s/files/1/0433/4351/1706/files/mysql_date_format.pdf
    • https://cdn.shopify.com/s/files/1/0433/4089/0265/files/gozedofazemerebeto.pdf
    • https://cdn.shopify.com/s/files/1/0431/0279/7986/files/mixexebipofekij.pdf
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/niwavunudifef.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006dcb.bin
7d1598ccc429abae06ee84f20328422e1fa034953f95e1db7d28afed09a1e8b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DCB 5688 bytes
font_01_sfnt_off00008122.bin
40af4ce9daee7c1129eb040b7abba2d26ea2cca33273b508ee5c1144a37747bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8122 10144 bytes

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