PDF malware analysis — malicious · 361799bd4390b11c

MALICIOUS

PDF

54.6 KB Created: 2020-08-31 13:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: aa07de95c20f0784bbfbad78731a91dc SHA-1: 360f327cc866c0024100f90062c980833df9daef SHA-256: 361799bd4390b11c778e8a9b7e0689073dad06483a1369b0cc8d60b1b486facf

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many pointing to PDFs hosted on static.usrfiles.com, which is flagged as a link farm. One of the primary links, 'https://ttraff.ru/wix?keyword=adderall+coffee+equivalent', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the suspicious URL and references to other PDF files, reinforcing the link farm and redirection attack pattern.

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/wix?keyword=adderall+coffee+equivalent
- https://static.usrfiles.com/ugd/b8c837_d16b9d2c77d5454a941cd3e21d0d2f7c.pdf
- https://static.usrfiles.com/ugd/11f207_16a93dbcbea34652a18f88e92b4e78f1.pdf
- https://static.usrfiles.com/ugd/b88e3d_aa781d25258e43079077a1c2086cc5d0.pdf
- https://static.usrfiles.com/ugd/b8c837_c3cc08bbea914980af47646a1456721e.pdf
- https://static.usrfiles.com/ugd/b8c837_8b13a6fc2a45440dbe6c3661ab8bcc37.pdf
- https://static.usrfiles.com/ugd/b8c837_9e6a3929249e468a8f60bc57758d863e.pdf
- https://static.usrfiles.com/ugd/defdb4_b37aa12a4a8c41cd81a16d3257a2dea0.pdf
- https://static.usrfiles.com/ugd/e2b09b_d56ecce092c14947abf722cd1ac0288c.pdf
- https://static.usrfiles.com/ugd/b8c837_69eacfa2fd24478ab8177c7c07243d6e.pdf
- https://static.usrfiles.com/ugd/b8c837_594b8dfe8dc34ac1bcaae8dfa4a08d61.pdf
- https://static.usrfiles.com/ugd/bdeb4c_4c2bbf297e234b318982aad705c26d64.pdf
- https://static.usrfiles.com/ugd/a6e5e9_5921a6726aa948ebaa6aec9ce0183efe.pdf
- https://static.usrfiles.com/ugd/79e0dc_31889e0cbf6b4a8a9eea1ee973123380.pdf
- https://static.usrfiles.com/ugd/e4ff69_d834fdc42ee841fa94a359d73b542a4c.pdf
- https://static.usrfiles.com/ugd/a91264_b69a8be9c95245b8ae80460cb1143828.pdf
- https://static.usrfiles.com/ugd/4ae4db_e09fb4fe4fc84a8baae1ce3a7c32eacb.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_off000098b3.bin` `e762999508cfe77f361b60500c00fe4ae1bd7c001ac51adfc5ee61b332508a86`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x98B3	5012 bytes
`font_01_sfnt_off0000a9d4.bin` `c4c78e123e8af0b99e67890d17ba5b931036ae0dc0033846a8b6486732dbf4bb`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA9D4	10516 bytes

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