PDF malware analysis — malicious · bd76a3a4500d1bfb

MALICIOUS

PDF

87.0 KB Created: 2020-09-08 14:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: f7375cc6081ae70be861697b5b088685 SHA-1: e101215f63c6f19d6cf8c0025ac1001ee65689bc SHA-256: bd76a3a4500d1bfb3ee09f66e42c21e558a140e2f94183e4139e4f536f52a424

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a direct link to a known malicious redirector, ttraff.ru, which is designed to lead users to malicious content. The ML classifier strongly indicates maliciousness, and the PDF structure itself is flagged for containing a mass external link farm, further supporting the malicious intent. The document body, though heavily obfuscated, contains the malicious URL.

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.ru/wix?keyword=chemische+energie+physik+formel
- https://static.usrfiles.com/ugd/12daa7_554f6bd6551d4d6991d632d1b31fc20d.pdf
- https://static.usrfiles.com/ugd/b4609a_bfa90d1bc95c4c5f8855205ba1a11395.pdf
- https://static.usrfiles.com/ugd/b8c837_6d0ab7c6fb494afe930a836094468a48.pdf
- https://static.usrfiles.com/ugd/622218_52682b9d360946cfb93cbdf5c66889c8.pdf
- https://static.usrfiles.com/ugd/03f576_d9bf59f4fbb1443f813d678e6da38554.pdf
- https://static.usrfiles.com/ugd/5899d5_93ede40c4cc54168a072c9cdb8923c26.pdf
- https://static.usrfiles.com/ugd/b8c837_8dca3c9f38e24c15b6f8745bcc7d741a.pdf
- https://static.usrfiles.com/ugd/26481d_af50bff1fd274f78a133d3f183fbd03d.pdf
- https://static.usrfiles.com/ugd/05900a_8fb4a79e140e42b2bcd83247aac43bf2.pdf
- https://static.usrfiles.com/ugd/8dde66_855b82d3e86341baacd2da88d635ed51.pdf
- https://static.usrfiles.com/ugd/bd5c68_ea4f0aa5c277491a8e6ffc14ca774059.pdf
- https://static.usrfiles.com/ugd/7c3584_4dc2ec5df3cf43a5a3f82b1397f810fb.pdf
- https://static.usrfiles.com/ugd/73c254_2e79886bd69e4ce78fc9a4bd2bf0d2d1.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_off000108d6.bin` `c18673cf99f7cd76f4631571fe3ba29c6842e6b8697e76e50c2da245b4505f23`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x108D6	5292 bytes
`font_01_sfnt_off00011ab8.bin` `a0b18491605113f8ccf3b0fb79b1d34e53aa5cfb60739a2eb6ae43bdb6b92b8b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11AB8	16896 bytes

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