PDF malware analysis — malicious · 759d7b09aa63d409

MALICIOUS

PDF

42.2 KB Created: 2020-08-29 12:40:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: fde72f122f244a56dcc8e4502f8ad4e2 SHA-1: c5598a67bd5c122766fa5305ce8cc804e8045f6f SHA-256: 759d7b09aa63d4097933ec6cf9857d2561c696edf0beb6ef7cf83ea7b34ab567

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.cc/wix?keyword=postulados+de+evans, which is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other links to what appears to be a link farm hosted on static.usrfiles.com. This suggests a social engineering attack aimed at directing users to malicious content.

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=postulados+de+evans
- https://static.usrfiles.com/ugd/b8c837_6fab0fb2f8284ee8a177317f2dddbf43.pdf
- https://static.usrfiles.com/ugd/b8c837_acb377122f174942975dd9f44d648a55.pdf
- https://static.usrfiles.com/ugd/89c6ad_170104c207fc4b40936949e65ca9209b.pdf
- https://static.usrfiles.com/ugd/b8c837_55886708fb3b4cd68b1e5640a4c7babe.pdf
- https://static.usrfiles.com/ugd/b8c837_28b413088bb9429c999e97ad9c7d5aa9.pdf
- https://static.usrfiles.com/ugd/b8c837_8873e0fd010140bca32eb23bcc26145e.pdf
- https://static.usrfiles.com/ugd/b8c837_1af16ffb28e6454c916cbb9a6fc20157.pdf
- https://cdn.shopify.com/s/files/1/0433/8706/0375/files/86277828208.pdf
- https://cdn.shopify.com/s/files/1/0432/1532/3291/files/41198072460.pdf
- https://static.usrfiles.com/ugd/b8c837_486622eb53dd40a3aef55f50b650a6ee.pdf
- https://static.usrfiles.com/ugd/b8c837_8157230c95704753aa5721fb6637c01b.pdf
- https://static.usrfiles.com/ugd/b8c837_2b092887eafa442484de6f598e3e6a7b.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_off000064b6.bin` `fa36cc060dc87f848f31048b195d5fc8b6511ffe43a1d564bbc78b5f05519b0d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x64B6	4784 bytes
`font_01_sfnt_off0000750f.bin` `5f4797a5922476e05056212a2ce9f83a8795a1d14a82192f28a57870ef63d01d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x750F	11688 bytes

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