PDF malware analysis — malicious · 023cf97ca5e3050b

MALICIOUS

PDF

41.3 KB Created: 2020-09-06 19:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 02454d80065e53e5e63f8455eac0442b SHA-1: 852ec42d6f9fef49e2313baf3485ec80264725f9 SHA-256: 023cf97ca5e3050b4227bc18e36a5d800929942816a628a1d1983da930f210c0

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. The document body, though heavily obfuscated, contains text suggesting it is a guide for an 'interactive APK' and includes the malicious URL. This indicates an attempt to trick users into visiting a malicious site, likely for further exploitation or malware delivery.

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.ru/pify?keyword=ceneval+guia+interactiva+apk
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/804ff6_3c00264448354b8191463edfa7d58ff7.pdf
- https://static.usrfiles.com/ugd/9e14ca_b8a3a5f7d13e403389d3e69fbaec42d8.pdf
- https://static.usrfiles.com/ugd/696b8a_3b9d7b1f35e14c138205eddb3e404d59.pdf
- https://static.usrfiles.com/ugd/bb10c5_1b54770b857d46f7acfcac246c1683b7.pdf
- https://static.usrfiles.com/ugd/25c42e_8083e67f0cf84cbab04f4feb2b343f21.pdf
- https://static.usrfiles.com/ugd/0df15e_0fe582c78d034c37a03afb644938bdd3.pdf
- https://static.usrfiles.com/ugd/8b4172_d9dd77236e4c4ab28ed1490cd3be8b0a.pdf
- https://static.usrfiles.com/ugd/3b7182_55a541c34cf9464ba31ed53fe89fd910.pdf
- https://static.usrfiles.com/ugd/bca722_7b4460313cca47f698b75ae1a277c709.pdf
- https://static.usrfiles.com/ugd/296484_cfc4a5dacac04d38b4d5907dad481860.pdf
- https://cdn.shopify.com/s/files/1/0434/8392/2585/files/usps_business_change_of_address_form.pdf
- https://cdn.shopify.com/s/files/1/0452/3006/3773/files/energy_pyramid_worksheet.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_off000055bd.bin` `c2276932ca5aa4077b49d97895c78ee2e6afee810043b64ce49fad0d30cdc67e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x55BD	4952 bytes
`font_01_sfnt_off000066b3.bin` `af31ffb3f4343198cffc06422377f4fe5a964ed699a5904c5b60fe969728ca66`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x66B3	15728 bytes

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