PDF malware analysis — malicious · 7856d0c49a9fdb34

MALICIOUS

PDF

42.3 KB Created: 2020-11-02 04:45:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26

MD5: 02b92797f838d1524e0d5db64b8fdef9 SHA-1: 5fc0689c92fab75adecfd2f395467c7fa3e06edb SHA-256: 7856d0c49a9fdb347d5a3b0a311eb677267fcb15a8e198769ed413b282b5141d

94 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/strik?keyword=compound+interest+worksheet+pdf'. The document body, though heavily obfuscated, appears to contain this same URL, suggesting the document's primary purpose is to trick users into visiting this malicious site. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 3

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.
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/strik?keyword=compound+interest+worksheet+pdf In PDF document text
- https://wurikosaradusif.weebly.com/uploads/1/3/1/3/131384544/xopowinubomokon-zozofefodijawuf-bimafajawevagu-pilavebenixe.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4390664/normal_5f96d1ca75d5d.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/sugaguxagu/modelo_biomedico_vs_modelo_biopsicosocial.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0436/4078/3008/files/35447338921.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0266/9238/6997/files/lokowizalemuwawetawuxina.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0506/7453/2532/files/asl_sign_for_answer.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0500/9683/2673/files/sutewexelosilosu.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0440/7623/6950/files/25052387159.pdfIn PDF document text
- https://s3.amazonaws.com/pugomonapoxuxe/farmacos_antimicoticos.pdfIn PDF document text
- https://s3.amazonaws.com/genedonapubefe/kumimivux.pdfIn 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_off0000683c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x683C	5100 bytes
SHA-256: `324333a49b81a087d354dc6d2f26e5683e2b05a23ee403e9febd304050a61c62`
`font_01_sfnt_off0000797f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x797F	10180 bytes
SHA-256: `52f7f67f3dfff8414f9674b1c7d9d66b82931df8011f6c03e4f3e3b4ac498f4e`

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