PDF malware analysis — malicious · c7e36afb043b3473

MALICIOUS

PDF

39.4 KB Created: 2020-09-10 11:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 03e7001d7819cd945885b2ce82bce1bf SHA-1: a750fe15344ae639445d289af5eed4033b5c7b7e SHA-256: c7e36afb043b34732614c14218e50088479ed2a93d57e528b02daa71deff82da

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file was flagged as malicious by an ML classifier and contains a high number of embedded links. One of these links, 'https://ttraff.com/wix?keyword=artigos+academicos+sobre+meio+ambiente+pdf', points to a known malicious redirector. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDFs hosted on 'static.usrfiles.com', suggesting a link farm or SEO manipulation tactic. The primary attack pattern appears to be leveraging these links for malicious redirection or to distribute further content.

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=artigos+academicos+sobre+meio+ambiente+pdf
- https://static.usrfiles.com/ugd/82e28d_cf0e9ba3fd2a4b11af31d0af277d6a79.pdf
- https://static.usrfiles.com/ugd/79cb75_34ef9793708746968558398e33007542.pdf
- https://static.usrfiles.com/ugd/b8c837_ecf32b164afe4548832fa7b57a86ce66.pdf
- https://static.usrfiles.com/ugd/55f640_ae6757cd907f4b3dafa93300fda2d74b.pdf
- https://static.usrfiles.com/ugd/46429b_f13a26327e064251b640b81f204da110.pdf
- https://static.usrfiles.com/ugd/1e11d0_0be20344028143878ecce4a8e99d5214.pdf
- https://static.usrfiles.com/ugd/5bf82b_764736adef104da39d87af013d02c0a3.pdf
- https://static.usrfiles.com/ugd/b88e3d_55b63198aea9446891dcb0696aaa8911.pdf
- https://static.usrfiles.com/ugd/fbccce_9f64b9ecb98a4c32a7b6e5774e38c296.pdf
- https://static.usrfiles.com/ugd/882da0_fe5cc90875bc41ecbdce3ce1444eec99.pdf
- https://static.usrfiles.com/ugd/b1dabf_de6eee0a98194da9b5d8386f83462b46.pdf
- https://static.usrfiles.com/ugd/8c2e83_02f15ebd9d444aa1af88a386ed567cbb.pdf
- https://static.usrfiles.com/ugd/cece23_827a92cfa56740ebad6b7c2d39f65d04.pdf
- https://static.usrfiles.com/ugd/764aaa_367d171a80624583b7d9932064024571.pdf
- https://static.usrfiles.com/ugd/f5892c_64984c38b70d401b95862447054c6bb8.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.

Filename	Kind	Source	Size
`font_00_sfnt_off00005694.bin` `ca84098868672de97cd125597f5379a93c4e4d7b965f242919541512a34e475a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5694	5572 bytes
`font_01_sfnt_off00006972.bin` `d988f74aaf75e2a940e88503dc5e095042974e6a42de1817173551325629e030`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6972	12568 bytes

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