Malicious PDF — malware analysis report

Static analysis result for SHA-256 c047910c5337612d…

MALICIOUS

PDF

40.4 KB Created: 2020-08-22 01:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aaaec3e5edf8b93f2419190aeca6af92 SHA-1: 67bc3d88bbaf3379d0a54c2b88f7f333ba87a7b7 SHA-256: c047910c5337612d530afa4622b5e8d7a48da65019bea5abdec995b296c266b9
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=guwahati+university+result+2019+marksheet'. The document body also contains this URL, suggesting a lure to trick users into believing they are accessing academic results. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=guwahati+university+result+2019+marksheet
    • http://tuvasi.harriscreekpta.com/uploads/1/3/1/4/131412290/5423395.pdf
    • http://files.theroute92.com/uploads/1/3/0/8/130873973/zuguxizamuri.pdf
    • https://cdn.shopify.com/s/files/1/0451/7101/5829/files/kalimba_tablature_software_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/1142/3902/files/taxeruvoguzaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2392/files/games_spider_solitaire_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0429/8945/3473/files/tanunizu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9427/8293/files/savonigewef.pdf
    • https://cdn.shopify.com/s/files/1/0433/3004/4062/files/vurigesoruki.pdf
    • https://cdn.shopify.com/s/files/1/0433/9384/3358/files/84782679790.pdf
    • https://cdn.shopify.com/s/files/1/0439/4264/1832/files/54743762401.pdf
    • https://cdn.shopify.com/s/files/1/0439/5306/2043/files/difference_between_concave_and_convex_lens.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f21.bin
394ec66564eca4ecdab751d8b42a268897c51aa131a2c5e745557d07a27e7c02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F21 5756 bytes
font_01_sfnt_off000072aa.bin
19040bf3e965a514d1b35ac9fe60d3139d61d5a8348855ebf196b2b236386d64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72AA 10128 bytes

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