PDF malware analysis — malicious · e59a3ab238c18473

MALICIOUS

PDF

36.3 KB Created: 2020-08-29 05:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: d692abfd9ce3db3f5ab711043b75a611 SHA-1: fa9922c6d136aa509a1e180db58e544ad7df06b5 SHA-256: e59a3ab238c184731b5dbcdd6f3e5d293dbe4a3dfbaebf9e16d55171302773ef

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains references to the redirector URL and a large number of other PDF links, suggesting a link farm or SEO poisoning tactic. 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.com/wix?keyword=linear+algebra+gilbert+strang+youtube
- https://static.usrfiles.com/ugd/b8c837_66982b67d4c2464abc877d2469cd7e2e.pdf
- https://static.usrfiles.com/ugd/b8c837_7d76c244ae7947faaaadb2c0fb6b1ba1.pdf
- https://static.usrfiles.com/ugd/b8c837_5ad51b6408ef4ed9af97f2a90451d3d1.pdf
- https://static.usrfiles.com/ugd/b8c837_3e45d570c0464ae5b21a94a66c464f58.pdf
- https://cdn.shopify.com/s/files/1/0437/6988/8920/files/gusosi.pdf
- https://cdn.shopify.com/s/files/1/0432/9370/4356/files/60904406614.pdf
- https://cdn.shopify.com/s/files/1/0434/5564/3813/files/14503830073.pdf
- https://cdn.shopify.com/s/files/1/0435/0243/6512/files/digokeradujonixenutu.pdf
- https://static.usrfiles.com/ugd/b8c837_a422e836c42a4d85b8a812df5422cc6d.pdf
- https://static.usrfiles.com/ugd/b8c837_78b162e72da3437086b193559b6a6bf9.pdf
- https://static.usrfiles.com/ugd/b8c837_176b72c5ac9848aeaf8d2b9acba2282f.pdf
- https://static.usrfiles.com/ugd/b8c837_7ff0e0ac7507455ea404cfcc88a122bd.pdf
- https://static.usrfiles.com/ugd/b8c837_be85e698856c4ec69b958fe88fd33715.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_off0000505d.bin` `d12d98071ef5e1a26dcb6f4750736ee0a9d24859f688486a7c17de676c77defb`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x505D	5036 bytes
`font_01_sfnt_off00006188.bin` `ab69f71ea2feab67577380f9b7ab175bf00f1d51b4ea8dd6f38d443783daecea`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6188	10324 bytes

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