Malicious PDF — malware analysis report

Static analysis result for SHA-256 3accca82d2afcc38…

MALICIOUS

PDF

64.6 KB Created: 2020-08-30 12:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b983f7362aa923f01a02be55b181d29f SHA-1: 2593966d571e035226d8ee0c0f56a1f69b7effdb SHA-256: 3accca82d2afcc38f665d605fafc1214f3e3dbe8e2b1b5123c28c3ac2d17238e
150 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=spanish+mass+parts'. Additionally, it exhibits characteristics of a PDF SEO link farm, with numerous external PDF links. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector URL is a strong indicator of a phishing or redirection attack.

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.me/wix?keyword=spanish+mass+parts
    • https://static.usrfiles.com/ugd/b8c837_4e879196731f4fcd8f61cb0a8b758c74.pdf
    • https://static.usrfiles.com/ugd/b8c837_c63e815e773a4c7ea93a1fa3253f668e.pdf
    • https://static.usrfiles.com/ugd/b8c837_752b1aaa1f574dcb93a3fbfb7c4d109f.pdf
    • https://static.usrfiles.com/ugd/d54300_e38f4b7c8491473b911e16223cfb5917.pdf
    • https://static.usrfiles.com/ugd/b8c837_2980f03b62a040bf9d78b0240be816ca.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zekimopesafirizaxos.pdf
    • https://cdn.shopify.com/s/files/1/0429/6038/8262/files/gekuliwatifelokodumojuwi.pdf
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/suvorobaxup.pdf
    • https://cdn.shopify.com/s/files/1/0433/9371/2286/files/96006964298.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/mimumelalusasojo.pdf
    • https://cdn.shopify.com/s/files/1/0436/3842/3710/files/82015263091.pdf
    • https://cdn.shopify.com/s/files/1/0430/8323/5489/files/42824267767.pdf
    • https://cdn.shopify.com/s/files/1/0432/0627/9332/files/71224209648.pdf
    • https://cdn.shopify.com/s/files/1/0434/4581/3414/files/48300045851.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_off0000bdfd.bin
9593a66d02caf2a6e301795e7e0d9ef43e822b37b322be92bac9f47b2454d0e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDFD 5132 bytes
font_01_sfnt_off0000cf3c.bin
433ef1ca260cb9d5f7547f8b6e288baea21581f3f9ba496a395bace0376246c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3C 11216 bytes

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