Malicious PDF — malware analysis report

Static analysis result for SHA-256 6739b115f0f05edb…

MALICIOUS

PDF

35.5 KB Created: 2020-08-21 17:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb6b57e0177edb0fb08559e4a268bc6f SHA-1: 31ee0843c35b246c5b99dad17d5af7eb269b1573 SHA-256: 6739b115f0f05edb7ef473352d3f053abecf47014db54d5ed3cefd992ab61811
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL that triggered the redirector heuristic. The presence of a large number of external PDF links suggests a link farm or SEO manipulation tactic to distribute malicious content.

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.ru/pify?keyword=lowly+worker+crossword+answer
    • http://files.serbaballet.com/uploads/1/3/0/7/130738876/6312849.pdf
    • http://namal.cosmicbirding.com/uploads/1/3/0/7/130738914/dopiregidadup.pdf
    • http://diguvof.secondhalfathletes.com/uploads/1/3/1/3/131379578/4073265.pdf
    • http://files.mindfulwellness.us/uploads/1/3/1/4/131453124/susaporuxux-karivumupujore-ramamaxef-vakesepupova.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/6112/4008/files/case_study_presentation_template_ppt.pdf
    • https://cdn.shopify.com/s/files/1/0434/0714/7166/files/bubujuxetel.pdf
    • https://cdn.shopify.com/s/files/1/0431/9900/4827/files/imail_iup_edu.pdf
    • https://cdn.shopify.com/s/files/1/0439/3956/1630/files/short_biography_of_mahatma_gandhi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5362/0136/files/vubupemipusufapaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/wavisowipuponerotexa.pdf
    • https://cdn.shopify.com/s/files/1/0430/2821/8010/files/13808694140.pdf
    • https://cdn.shopify.com/s/files/1/0430/1606/1091/files/welaso.pdf
    • https://cdn.shopify.com/s/files/1/0435/9893/8274/files/venez.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20424522606.pdf
    • https://cdn.shopify.com/s/files/1/0434/4371/6262/files/kokufanolofele.pdf
    • https://cdn.shopify.com/s/files/1/0432/0493/5835/files/nationwide_app_android_10.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0273/files/52347120395.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_off00004d3c.bin
b7dce44f3b92b7a5575d965bf5336877c97574c2e96c6e9c191f5ebf5eba58d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D3C 5132 bytes
font_01_sfnt_off00005ed8.bin
6b26bbc4f88ed33aaf2700cef9dbf468d3d662f98302928d2b8b53d1dfa985a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED8 10060 bytes

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