PDF malware analysis — malicious · 50ddb416234d1b8c

MALICIOUS

PDF

72.6 KB Created: 2020-12-21 10:56:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 6c82de6e40f981bde32566dbde34f6f2 SHA-1: 11ddfc7f0207d821e7b433d598f763f0b0a9c367 SHA-256: 50ddb416234d1b8cdc31ba3c7cdbaa8125a3c429c0a37733e34676560272a0b2

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to redirector infrastructure or other PDFs, indicating a link farm designed to obscure the ultimate destination. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the structure suggests a malicious redirection attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9971

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://traffmen.ru/strik?utm_term=pogs+90s+value
- https://cdn-cms.f-static.net/uploads/4368500/normal_5fada28f09ea3.pdf
- https://wafulezejo.weebly.com/uploads/1/3/4/7/134748518/tetutuvoretib.pdf
- https://cdn-cms.f-static.net/uploads/4380379/normal_5fb5434b1bed0.pdf
- https://robesiso.weebly.com/uploads/1/3/4/5/134501854/a3eea.pdf
- https://cdn-cms.f-static.net/uploads/4389074/normal_5f8de79d83527.pdf
- https://static.s123-cdn-static.com/uploads/4423148/normal_5fc4080ecb830.pdf
- https://static.s123-cdn-static.com/uploads/4466143/normal_5fcfa853aed02.pdf
- https://cdn-cms.f-static.net/uploads/4421218/normal_5fab9c8f36eb8.pdf
- https://zuwukozoxuwiged.weebly.com/uploads/1/3/4/7/134713444/buligixogad.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- http://www.daltonmaag.com/
- 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d3d9.bin` `af68a0ad2170638d44f6a59f0a043bf0f007fc20b662a482e976d03a0c896875`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD3D9	4764 bytes
`font_01_sfnt_off0000e411.bin` `9b33e65a3d7b0332ed1fa61e3b42ad4de29409b56518e80ea8204ec59226bf1f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE411	10776 bytes
`font_02_sfnt_off00010885.bin` `1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10885	4324 bytes

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