PDF malware analysis — malicious · f486537d05846c7c

MALICIOUS

PDF

43.0 KB Created: 2020-09-03 09:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: f1af5f1771c7a5baf9f619cbe3eb800b SHA-1: 4a2b317df488406c3e70e3be7b0b3c95b4b1e6cf SHA-256: f486537d05846c7c2aa632d5c4ac4a49e5a9df92f4656dd275aeacd46b1182da

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a technical manual, which is a common lure. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic suggests a large number of outbound links designed to manipulate search results or distribute malware. The primary malicious IOC is the redirector 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.club/wix?keyword=amphibious+assault+vehicle+technical+manual
- https://static.usrfiles.com/ugd/01f9b9_2c000ba4f3fc448d8aa67e28aaee14fd.pdf
- https://static.usrfiles.com/ugd/b8c837_312d2b7503a846dc952064edeeabe65f.pdf
- https://static.usrfiles.com/ugd/9ff9b8_3c0d59b048b746169b41d82c475e5084.pdf
- https://static.usrfiles.com/ugd/3e9e83_2b6c6e55cad8462db898f3da5feee13d.pdf
- https://static.usrfiles.com/ugd/097bd5_855ca69a3ecf412592a30e87aaf423ed.pdf
- https://static.usrfiles.com/ugd/b8c837_382e334395aa4a4f8bcb044adaced5c0.pdf
- https://static.usrfiles.com/ugd/f65518_e610d0fa0bd540219b5a488fa83d4f30.pdf
- https://static.usrfiles.com/ugd/b98abb_c43384b3ad6d4aa484e7f38ee51b656c.pdf
- https://static.usrfiles.com/ugd/b8c837_c181ee234ed64cc6ad4636f5a7081130.pdf
- https://static.usrfiles.com/ugd/6116da_eb9ed1d042a840269b24bdf9563383eb.pdf
- https://static.usrfiles.com/ugd/3ce946_4c79376fe11341c284be9ba214ce1093.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_off00006b50.bin` `37387b417ee86fc3ef115b7977ef2f7929f85d3af30e46ee72f5f4fc09ad70ad`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6B50	5264 bytes
`font_01_sfnt_off00007d12.bin` `59969aa68cfc9c8019a9c4d11e69a56703ffecc49da1e2e436dbffd8ecb9a04b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7D12	9988 bytes

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