Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a51f0fe9ffcc30d…

MALICIOUS

PDF

43.0 KB Created: 2020-08-29 14:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 019a20ec77e6973d2907f9acfdf3c8cc SHA-1: 86d3857e67a44b1cf9b01eb3472bce594ae8f7c3 SHA-256: 4a51f0fe9ffcc30d13af4e156a26bc01c7282612a046bb6ac6db7afbe3378a3f
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The primary malicious URL identified is ttraff.com, which is used in conjunction with a keyword that appears to be a lure. The document body, though heavily obfuscated, contains references to this URL and also to wkhtmltopdf, suggesting it was generated programmatically. The presence of numerous links to static.usrfiles.com, while marked as benign, contributes to the overall link farm characteristic.

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.com/wix?keyword=pippi+calzaslargas+libro+2018
    • https://static.usrfiles.com/ugd/b8c837_b67014d539ea4db3bcd7b30ca35ce6ec.pdf
    • https://static.usrfiles.com/ugd/b8c837_51cdce691b974b5bbe43889054a00054.pdf
    • https://static.usrfiles.com/ugd/b8c837_5081172ece1e4796955af9159a41e5d9.pdf
    • https://static.usrfiles.com/ugd/ca32a8_cd5ffb87a98f481ab5eab0b44463acf0.pdf
    • https://static.usrfiles.com/ugd/b8c837_cb8444e3457a4832bae96b7ddb14674a.pdf
    • https://static.usrfiles.com/ugd/9219f8_92f53a81192e4feda0880e1f847c6fa7.pdf
    • https://static.usrfiles.com/ugd/b8c837_a87f3a1e86b047a29fc930a9d4ecd5e2.pdf
    • https://static.usrfiles.com/ugd/b8c837_ff46c4a69464428d8550cc546ebdd00c.pdf
    • https://static.usrfiles.com/ugd/b8c837_00f12b5f256a46199567452546e0d61c.pdf
    • https://static.usrfiles.com/ugd/b8c837_d981cf72802143b6b7f0c835c72fc7fa.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c67f7cb46ec4db4bb313ee2c5d72f4c.pdf
    • https://static.usrfiles.com/ugd/b8c837_b88a168183e74e4495651ea79352d3bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_c6913ae6bdec4ea0aebe9d4c3286ee4c.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_off00006820.bin
70cada688b158499ac1ab0ab0befa48e2da747ccb03c4041ec8fc77f977872e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6820 5812 bytes
font_01_sfnt_off00007bf4.bin
c94374927d23e0030a034574bc003f709e04a96520d9e601d540b50f57b630e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF4 10724 bytes

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