Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b5ad6eb81470071…

MALICIOUS

PDF

50.8 KB Created: 2020-08-31 12:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4aa1bc26d2696c0030896ca191badec SHA-1: b355b139f2614a70c6fa854b1e467770aefa3a99 SHA-256: 2b5ad6eb81470071c1e0fd4feeb948947ddd0b0a7d8ef323c97ca4877a7f0b4a
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.cc/wix?keyword=required+key+missing+from+keyring'. This URL is likely used to deliver a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, contains the same URL and a list of other PDF links, suggesting a link farm or redirection strategy. The ML classifier also 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.cc/wix?keyword=required+key+missing+from+keyring
    • https://static.usrfiles.com/ugd/9c43ec_614331f8089d44a78c146f7240f85800.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4988329c7404ffa87ceea3411f0b592.pdf
    • https://static.usrfiles.com/ugd/c068f8_d5f07209089b43919d6a06a94217cc94.pdf
    • https://static.usrfiles.com/ugd/1b8612_c7fcd0351a6d42778fd6f5b50c5ec006.pdf
    • https://static.usrfiles.com/ugd/6a7407_02de60e38b89469fab1573353fdbdfe3.pdf
    • https://static.usrfiles.com/ugd/b8c837_49071d4b9ba74fe3a057b0abc313b61e.pdf
    • https://static.usrfiles.com/ugd/f84671_864748976985450bad9f6851cd220ed1.pdf
    • https://static.usrfiles.com/ugd/b8c837_adbb3d1db2164523bd9a24be3bc4e5ce.pdf
    • https://static.usrfiles.com/ugd/77941b_376739b9a76448549f00e0951b9192ac.pdf
    • https://static.usrfiles.com/ugd/784815_af153bbf78004085aee3bdd0cef89174.pdf
    • https://static.usrfiles.com/ugd/0286dd_eae770d4142447c0ac4a1fa94f7a8149.pdf
    • https://static.usrfiles.com/ugd/0c4177_7ff6cf28258e4915815a059618bb51df.pdf
    • https://static.usrfiles.com/ugd/19103d_e145578ccc2c4e0983a105568f61bff1.pdf
    • https://static.usrfiles.com/ugd/b8c837_d27470ce9b60460db4db6588a0ddc319.pdf
    • https://static.usrfiles.com/ugd/b8c837_1d9d6dc979fe4e8493946f2e5b0cc57e.pdf
    • https://cdn.shopify.com/s/files/1/0427/8625/9100/files/39157747327.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4827/files/8361969040.pdf
    • https://cdn.shopify.com/s/files/1/0440/2793/6918/files/optiplex_790_drivers.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5710/files/86281852281.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98029452840.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070f4.bin
64f88b2841a2185cc16c1224b289834077d8ac103015bae6c75f20c1b344ccd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70F4 5284 bytes
font_01_sfnt_off000082df.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82DF 1800 bytes
font_02_sfnt_off00008b6d.bin
567b0eab29548042dfe68c198a665502a40300aa810b1f592165a8cf43a37f31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B6D 15972 bytes

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