PDF malware analysis — malicious · 7fa671918725883c

MALICIOUS

PDF

42.0 KB Created: 2020-11-05 12:00:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 5a3299740eb104ff5d6d881da2aac784 SHA-1: 553a6d27ee0568d83b6983c04a6bdd27a3f8d1f8 SHA-256: 7fa671918725883c62cbe0068945f848b69cde1d73c55d6bc40fe48544e19225

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one pointing to a known malicious redirector at 'https://ttraff.club/123?keyword=chinese+atv+repair+manuals+free'. The document body, though partially obfuscated, also contains this URL and other links, suggesting a link farm or phishing lure. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to 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://ttraff.club/123?keyword=chinese+atv+repair+manuals+free
- https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/2568193.pdf
- https://cdn-cms.f-static.net/uploads/4366014/normal_5f8973ac67110.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://s3.amazonaws.com/tadovu/78599625509.pdf
- https://s3.amazonaws.com/sulasatevirexo/arthrex_mpfl_technique.pdf
- https://s3.amazonaws.com/serogajugomiji/gumamesimojoru.pdf
- https://s3.amazonaws.com/henghuili-files/36162847041.pdf
- https://s3.amazonaws.com/solonebosop/duzibu.pdf
- https://s3.amazonaws.com/susopuzupure/gigedekeduvire.pdf
- https://s3.amazonaws.com/wonoti/nekedanosorivoxidibodifip.pdf
- https://s3.amazonaws.com/gagagakigibapo/minecraft_apk_14.pdf
- https://s3.amazonaws.com/titugome/45924358986.pdf
- https://s3.amazonaws.com/xebareto/dusalib.pdf
- https://s3.amazonaws.com/zupenafud/killing_chloroplasts_answer_key_google_drive.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_off000065b4.bin` `7b51d1f043a14dd572f095e06fbf2d0ccd6cdecf060d3264d43a61358881df8a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x65B4	5108 bytes
`font_01_sfnt_off000076ed.bin` `e3b539d10a28dd7733385820461acf40274a7e628af9df80cfa7b872f787131f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x76ED	10628 bytes

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