Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ddc355e035c59c…

MALICIOUS

PDF

38.6 KB Created: 2020-08-30 08:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7fbc2bc8d30428d6cd65ccbb3dfcefb4 SHA-1: a9277246a687dd84f4a1fde71893dad203a37f73 SHA-256: b5ddc355e035c59c777d51d91faa91d83de97c8ae350fcfcab678f91297d3a41
120 Risk Score

Malware Insights

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

The PDF file contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the critical heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The embedded URL 'https://ttraff.cc/wix?keyword=cms+introductory+course+workbook' is the primary indicator of this malicious redirection. The document body, though heavily obfuscated, contains references to a 'cms introductory course workbook', suggesting a lure to entice clicks. The presence of numerous Shopify-hosted PDF links, as flagged by PDF_SEO_LINK_FARM, further supports the attack pattern of using seemingly legitimate hosting for malicious redirection.

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=cms+introductory+course+workbook
    • https://cdn.shopify.com/s/files/1/0463/0354/3453/files/15838956477.pdf
    • https://cdn.shopify.com/s/files/1/0433/5943/6951/files/wusafemuxasemota.pdf
    • https://cdn.shopify.com/s/files/1/0432/1761/7057/files/philly_pretzel_factory_franchise_information.pdf
    • https://cdn.shopify.com/s/files/1/0427/6640/1692/files/politica_social_no_capitalismo_tardio.pdf
    • https://cdn.shopify.com/s/files/1/0434/6164/0352/files/bakuriju.pdf
    • https://cdn.shopify.com/s/files/1/0433/1349/6222/files/71920892715.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23158701460.pdf
    • https://cdn.shopify.com/s/files/1/0432/5556/2398/files/bovutulojulomizi.pdf
    • https://static.usrfiles.com/ugd/6f53d7_e1cfb84d5e34422a9a318f4d6e7a8e4d.pdf
    • https://static.usrfiles.com/ugd/6da380_e9e39d4fb52f4c6ca924840bde6882d4.pdf
    • https://static.usrfiles.com/ugd/b5aed9_74c4e0f1a18c4d17b1c67370bbfb791e.pdf
    • https://cdn.shopify.com/s/files/1/0438/7602/4475/files/51663307950.pdf
    • https://cdn.shopify.com/s/files/1/0429/3220/7782/files/21588560251.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_off000058d1.bin
5ee2a317bbf0bef7b78e1896c41a69ad67c375c9e8f4ef4ec9be29cf266e7952		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58D1 5148 bytes
font_01_sfnt_off00006a55.bin
36e4c4fbbd86c0bbead71b3ef618ef8fce69136ab7b5311c9f07a2767b173bae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A55 10444 bytes

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