PDF malware analysis — malicious · 9be183e2f25291e4

MALICIOUS

PDF

43.6 KB Created: 2020-10-15 03:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22

MD5: cbd6f7de5e0874c2c1c0fde42874eec5 SHA-1: 73f5ce0bb89465cca48954b238820521330ec33e SHA-256: 9be183e2f25291e4bb8e2e57ef86daf928e1e844d822b8ec1ccd91f68ec72073

224 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document functions as a link farm, directing users to a malicious redirector disguised as a Firefox update page. The document contains numerous embedded URLs pointing to disposable hosting services, likely to obscure the final malicious destination. The ML classifier strongly indicates maliciousness, and the heuristic firings confirm the use of a social-engineering lure for browser update installation.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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.
Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE

Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
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://gettraff.ru/123?keyword=firefox+android+update+page In PDF document text
- https://site-1040177.mozfiles.com/files/1040177/82814071290.pdfIn PDF document text
- https://site-1043365.mozfiles.com/files/1043365/farunetunu.pdfIn PDF document text
- https://site-1038422.mozfiles.com/files/1038422/24209931131.pdfIn PDF document text
- https://site-1043530.mozfiles.com/files/1043530/66889757542.pdfIn PDF document text
- https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/fivoz.pdfIn PDF document text
- https://kelobutino.weebly.com/uploads/1/3/0/9/130969458/54c7be9deaa1.pdfIn PDF document text
- https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/ramugimexixepaba.pdfIn PDF document text
- https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/rezareludufiven-voxodopi.pdfIn PDF document text
- https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/pokobu-pidoror-pekirez.pdfIn PDF document text
- https://wepeweguwerixum.weebly.com/uploads/1/3/1/8/131856135/7297961.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366063/normal_5f8750b0426bd.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366011/normal_5f87742a62044.pdfIn PDF document text
- https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/7360136.pdfIn PDF document text
- https://texitanoz.weebly.com/uploads/1/3/0/7/130739996/wavumopeduwi-vivugopofujudoz-lixepufinuza.pdfIn PDF document text
- https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/d96ddb407408.pdfIn PDF document text
- https://xuvakaxatal.weebly.com/uploads/1/3/1/0/131070170/dawelusonevu-bodipalotit-xejemevunif.pdfIn PDF document text
- https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/2697538.pdfIn PDF document text
- https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/xojajuv-mitegejitokuxig.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00006c22.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6C22	5020 bytes
SHA-256: `4c26ae9107b3a21a2a0edc9d0806b6dd0ac3b9e5d88ca9cfaec26bf0f25a02fb`
`font_01_sfnt_off00007d4d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7D4D	10368 bytes
SHA-256: `db66b3f9979c3eb7ca4f3451fe845b8a86d3bcb53924c31939bdf0740c146285`

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