PDF malware analysis — malicious · 3cf63cd2d876b76b

MALICIOUS

PDF

36.7 KB Created: 2020-08-31 02:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: db6dfa00f0e968aab61e636047b71e6d SHA-1: 04d813f205da360a74b676fad2fd3f39c8f9967a SHA-256: 3cf63cd2d876b76b2b1eaceeb1bbc71c68399f43b434b052aed06189067c44b4

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.cc, disguised with a keyword related to medical anesthesia. The document body, though heavily obfuscated, contains this URL and other benign-looking PDF links, suggesting a lure to a malicious site. The ML classifier also strongly indicated maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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.
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
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=fundamentos+de+anestesia+regional+pdf
- https://static.usrfiles.com/ugd/b4a829_9aba1985e82c4cddaaf3f170005796f4.pdf
- https://static.usrfiles.com/ugd/b8c837_cb47b5f1d4014dbdb96ac6e2fda0fb45.pdf
- https://static.usrfiles.com/ugd/b8c837_a70e80a52f3a4c23bb7641c38ced28af.pdf
- https://cdn.shopify.com/s/files/1/0431/5483/3564/files/31008812786.pdf
- https://static.usrfiles.com/ugd/77941b_69862f47bdc34964997392e987b2b6fa.pdf
- https://static.usrfiles.com/ugd/913720_04f6bf8d64f542f3b36dc9e6ca57d3a9.pdf
- https://static.usrfiles.com/ugd/930050_347468c01c2142e8b7d256d9c08e142c.pdf
- https://static.usrfiles.com/ugd/48d9a1_4e07f38383d84635a645fee3401e7848.pdf
- https://static.usrfiles.com/ugd/b8c837_a8de1a510741490685f51a983956bd75.pdf
- https://static.usrfiles.com/ugd/9a242c_f8a63c9d50e441b99c343d9bf9e51ee3.pdf
- https://static.usrfiles.com/ugd/1cc7e8_c0cbb127c82643768dc63ee3da98b220.pdf
- https://static.usrfiles.com/ugd/c0fca2_02ef3ea2c4bb4434b9a990d567d65290.pdf
- https://static.usrfiles.com/ugd/374ce0_908eda643dc546f1a25756ef47057a52.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_off000050a3.bin` `01c2b2934ac71d41a42c03f88e54e6bd0d8e8f37c31ab85f22a445852266682d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x50A3	5316 bytes
`font_01_sfnt_off000062a0.bin` `7fc65fe1a6c763e798c35a6cf92437edc8118a6d41d8844aba3d018fe3c7a7b5`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x62A0	10380 bytes

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