Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b53b87d97f4db46…

MALICIOUS

PDF

45.7 KB Created: 2020-08-12 09:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a34809651dc225f3d471f88d94b73904 SHA-1: aabbfd35955374843d9e5a708dc031fc507cc7eb SHA-256: 8b53b87d97f4db467d6c1cb097716b0dda76abb50986822c7cdc2c12ecc3d38d
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a reference to the URL https://ttraff.ru/pify?keyword=bpmn+2.+0+quick+guide+pdf, suggesting a lure to download further content. The presence of multiple Shopify URLs, some flagged as benign and others unknown, 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=bpmn+2.+0+quick+guide+pdf
    • http://files.whitestonemv.com/uploads/1/3/1/3/131378923/6a977.pdf
    • http://jiguru.andy-buchan.co.uk/uploads/1/3/2/6/132682883/811625.pdf
    • http://files.capitalfinancialplanningcharitablefoundation.com/uploads/1/3/1/4/131437669/9624467.pdf
    • https://cdn.shopify.com/s/files/1/0434/3005/2005/files/14465508116.pdf
    • https://cdn.shopify.com/s/files/1/0439/2674/9339/files/ancient_greece_map_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/1328/3735/files/69604500101.pdf
    • https://cdn.shopify.com/s/files/1/0441/4255/9384/files/atlas_lathe_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dutevitijenunolekegek.pdf
    • https://cdn.shopify.com/s/files/1/0432/9917/6612/files/femazabirokaredofufokit.pdf
    • https://cdn.shopify.com/s/files/1/0431/8507/8423/files/beowulf_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/7427/3948/files/97184882813.pdf
    • https://cdn.shopify.com/s/files/1/0435/6043/5871/files/fevutex.pdf
    • https://cdn.shopify.com/s/files/1/0435/3916/9429/files/todagit.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_off00007339.bin
eac0810891f11fb0553d67d2930ced9141fd1c981f51384700e163259ee76838		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7339 5504 bytes
font_01_sfnt_off000085ea.bin
abe7b12fc7cf2234ba70bef5f1ec1155e80c8f566ae6e4cc43e59f19b4c179de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85EA 10244 bytes

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