PDF malware analysis — malicious · 56ac736d8e1d1cfe

MALICIOUS

PDF

42.2 KB Created: 2020-08-29 03:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: b1e505da8f3e5c54103bea5e9c3f6613 SHA-1: 5d6f03bacd23809a6d564d42c75791d432901ffd SHA-256: 56ac736d8e1d1cfe796a3d05cc3eeb4e99c9652f4bd5f3f9cca307faed881606

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, many of which point to a link farm hosted on static.usrfiles.com. Crucially, one of the embedded URLs, https://ttraff.ru/wix?keyword=manualidades+para+decorar+un+arbol+de+navidad, is identified as a malicious redirector. This suggests the document's primary purpose is to lure users to malicious infrastructure through a deceptive link farm.

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=manualidades+para+decorar+un+arbol+de+navidad
- https://static.usrfiles.com/ugd/b8c837_e5b62454bc6f48cb9e2f2105fbeffaeb.pdf
- https://static.usrfiles.com/ugd/b8c837_47b202d7a54d49bcb8fff20e4828ace3.pdf
- https://static.usrfiles.com/ugd/b8c837_496b057afb8d4dd8bef8a6d1c2d62ece.pdf
- https://static.usrfiles.com/ugd/b8c837_f3f4a0e144e5436d86d7252bc50e2254.pdf
- https://static.usrfiles.com/ugd/b8c837_ea0533ce3c8841feb61ecfa0bf0c474c.pdf
- https://static.usrfiles.com/ugd/b8c837_564d0250d75146868f5fcd3ad17bf3a9.pdf
- https://static.usrfiles.com/ugd/b8c837_65973569031d47b687af180330fcd4eb.pdf
- https://static.usrfiles.com/ugd/b8c837_f1ce2551df0d42a18309366895690d5c.pdf
- https://static.usrfiles.com/ugd/b8c837_2e5da1b3069347dd8e0e2853f2914e38.pdf
- https://static.usrfiles.com/ugd/b8c837_460d0313e2ff4da7bcfcd08254136c0b.pdf
- https://static.usrfiles.com/ugd/b8c837_39819be299b749e4a93c58badf226a85.pdf
- https://static.usrfiles.com/ugd/b8c837_2526511def294fe18bce66adcfdb3219.pdf
- https://static.usrfiles.com/ugd/b8c837_892a9f32df13495b9abec32675d6c7e3.pdf
- https://static.usrfiles.com/ugd/b8c837_d848dcfe411946d194bb6a3471ffe9de.pdf
- https://static.usrfiles.com/ugd/b8c837_dd2eee70ff68435f8f69e24793e08da0.pdf
- https://static.usrfiles.com/ugd/b8c837_9d05008204cc4b7b92e86b7602ae428b.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_off000064af.bin` `e10dd80eb1acce6d7fa3f0a155320e9d1ee4484068c289dc0c41a42d4d4b345b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x64AF	5272 bytes
`font_01_sfnt_off000076a5.bin` `592740b49866412006c4c514ad06528e5d156054fa336affbb7a0adffd1fe32b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x76A5	10824 bytes

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