Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c402dd71cbab7c6…

MALICIOUS

PDF

42.2 KB Created: 2020-09-01 07:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c492633e5414ddb94ee1d1056dd83a7 SHA-1: 0026c8ed3959d166c6384ebf7e7bd97eabcefbca SHA-256: 9c402dd71cbab7c682b070049d406083a191e968c5e5238c90fd91a4a1f6f845
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a mass of external links, with one prominent link identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to an 'expense spreadsheet printable'. The primary malicious URL, https://ttraff.cc/wix?keyword=expense+spreadsheet+printable, is likely used to redirect the user to a further malicious destination. The presence of numerous links to static.usrfiles.com, while flagged as benign, indicates a link farm strategy.

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.cc/wix?keyword=expense+spreadsheet+printable
    • https://static.usrfiles.com/ugd/b8c837_2d075c833b8c441498b884f0f9adf0fa.pdf
    • https://static.usrfiles.com/ugd/9ea91e_448539794d214147b65a9866834ad4bf.pdf
    • https://static.usrfiles.com/ugd/61f964_393a08171411477dae3e5ca3aebc8455.pdf
    • https://static.usrfiles.com/ugd/b8c837_36015bfecebd4de887802a544476f7cb.pdf
    • https://static.usrfiles.com/ugd/b8bbd7_8d14e62eadc14fa8bb91a0c1ce2a8574.pdf
    • https://static.usrfiles.com/ugd/f09a9d_3513f232f3d144c0bbb84b35bcaf29b4.pdf
    • https://static.usrfiles.com/ugd/1be480_5c3a217929664c95be7c3af6b51f89f4.pdf
    • https://static.usrfiles.com/ugd/fd3290_c97ad6c0adff446b84d3e1b8901f3135.pdf
    • https://static.usrfiles.com/ugd/b8c837_71f563edebbe41209750c9d1d639ab3c.pdf
    • https://static.usrfiles.com/ugd/ce0e6d_84918e9bc7e347a6ab37571aa30a86af.pdf
    • https://cdn.shopify.com/s/files/1/0432/1987/8048/files/execute_disable_bit.pdf
    • https://cdn.shopify.com/s/files/1/0437/3970/9589/files/hyperkalemia_management.pdf
    • https://cdn.shopify.com/s/files/1/0438/0547/4978/files/debovezafidolov.pdf
    • https://cdn.shopify.com/s/files/1/0463/1763/3698/files/transformers_robots_in_disguise_2015_decepticons.pdf
    • https://cdn.shopify.com/s/files/1/0463/3110/1345/files/46140276020.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_off00006576.bin
2fb2ff887313331c3deb30bec564826d021b5fca061effa14c2bc5c2d313e3cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6576 5212 bytes
font_01_sfnt_off00007723.bin
10ff03b69a8961eff160af27859e4b8ace20e11e028954b45a5d9fd25ebdc2cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7723 11352 bytes

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