PDF malware analysis — malicious · 25834b0abc0bdd01

MALICIOUS

PDF

43.5 KB Created: 2020-11-09 11:52:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 7ff2288345cec9154c2144413fd5dcb4 SHA-1: 1d11ea15f91bb16ba1c4a3d4c36784172c62b335 SHA-256: 25834b0abc0bdd017efe88bc50563b05ae4bda1baec6cb970cd1724419bfbcbe

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm designed to lure users to malicious sites. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves using deceptive links within the document to redirect users to potentially harmful 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://cctraff.ru/123?keyword=arksen+arc+welder+bx1-250c1+manual
- https://cdn-cms.f-static.net/uploads/4373240/normal_5fa4521f51d6e.pdf
- https://dojufewuwi.weebly.com/uploads/1/3/4/2/134235401/tedisifizunosizure.pdf
- https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/24c86.pdf
- https://cdn-cms.f-static.net/uploads/4375894/normal_5f8a8f009d245.pdf
- https://cdn-cms.f-static.net/uploads/4387054/normal_5f985251a50b2.pdf
- https://wojeribexojuxu.weebly.com/uploads/1/3/1/8/131856158/10759e9a.pdf
- https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/bc2cb.pdf
- https://wavuvavezexa.weebly.com/uploads/1/3/0/7/130775629/6087415.pdf
- https://cdn-cms.f-static.net/uploads/4420934/normal_5fa5415a49df0.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://s3.amazonaws.com/jebokizez/language_awareness_book.pdf
- https://s3.amazonaws.com/dorobukasawituw/fuzivarupo.pdf
- https://uploads.strikinglycdn.com/files/ae4ff4ab-b868-4ac4-a155-4192993a86c4/juxipex.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/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00006a68.bin` `6b5ffe0a2f6fff9d57cbd6855c276bc7f93657e4c359691f3ae9e04bbc0125f4`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6A68	5920 bytes
`font_01_sfnt_off00007e9f.bin` `f5e84a18d4dddd8f1e0cf3a49bc3cce369f1f0da04fb3a53212c7507d68a48e8`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7E9F	10448 bytes

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