Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ec1060e60f8cec…

MALICIOUS

PDF

57.2 KB Created: 2020-07-31 08:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0810e4dc28e58673b041a1fed722680 SHA-1: 09824c994a569acb07584065bf4b08e3695bd38d SHA-256: d7ec1060e60f8cec0847ea2f488ad768357b3482969f63f6a29c42e873ced47a
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass external link farm, with the primary malicious redirector URL being ttraff.ru. The document body, though heavily obfuscated, appears to be related to a 'weighted average cost of capital case study pdf', suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, and multiple heuristics confirm the presence of malicious redirector links and a link farm.

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=weighted+average+cost+of+capital+case+study+pdf
    • http://files.craigformissouri.com/uploads/1/3/1/6/131637131/zubag.pdf
    • http://files.millercounselingserv.com/uploads/1/3/1/0/131070604/ca9f1af929ac2.pdf
    • http://files.jesszhouzexi.com/uploads/1/3/1/4/131406527/16814c.pdf
    • http://files.caitlinanthony.com/uploads/1/3/0/7/130739616/9529416.pdf
    • https://cdn.shopify.com/s/files/1/0433/1018/6654/files/kurujuwekuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/wemurukuvi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8546/3713/files/gekatu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5727/5299/files/26348466172.pdf
    • https://cdn.shopify.com/s/files/1/0430/8716/7641/files/raxeka.pdf
    • https://cdn.shopify.com/s/files/1/0433/7090/5750/files/kaboludolaxopaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/1332/5471/files/depij.pdf
    • https://cdn.shopify.com/s/files/1/0428/2246/7750/files/97529786760.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bodadajigewodozisidezufe.pdf
    • https://cdn.shopify.com/s/files/1/0433/8545/4757/files/todewobobe.pdf
    • https://cdn.shopify.com/s/files/1/0428/5156/5724/files/92512134279.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9290/files/159360826.pdf
    • https://cdn.shopify.com/s/files/1/0428/9029/7507/files/97254897342.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_off000099d9.bin
f8b8eb8d3949a3973d2611658a1ec0707d151bd9b792c4e463861d016fae6596		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99D9 5368 bytes
font_01_sfnt_off0000ac50.bin
200abb15ffc9f28feba21d998f604ab694b712e6a473b38e0e04c2b02c285f70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC50 13288 bytes

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