PDF malware analysis — malicious · c90e8b06d25c2c2f

MALICIOUS

PDF

46.4 KB Created: 2020-07-08 13:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: d436aa50ef9be3c2f8c7561883026412 SHA-1: 2697f9f57a8ad1b0335c2f03139804b2d3c31774 SHA-256: c90e8b06d25c2c2f6d02171e52d564350f6f8e58300525dbdffa740dde554491

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of the primary links directs to a known malicious redirector, indicating a phishing or malicious content distribution attempt. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead 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.ru/wb?keyword=harnessing%20the%20science%20of%20persuasion%20harvard%20business%20review%20pdf
- http://files.mr-stevens.com/uploads/1/3/0/7/130776864/zoxakaso.pdf
- http://files.batrssocal.com/uploads/1/3/1/3/131384789/vipibifoxoteroxu.pdf
- http://files.david-jones-society.org/uploads/1/3/0/8/130814642/dixagululekivex_tekixomixe.pdf
- http://files.kaynoteonline.com/uploads/1/3/2/7/132712514/tenup.pdf
- http://files.gammaetaomegaaka.org/uploads/1/3/1/6/131636990/5608641.pdf
- http://files.stcharlescatholicchurch.com/uploads/1/3/0/9/130969532/vidimonamolezi.pdf
- https://xebekuno.files.wordpress.com/2020/06/91701266915.pdf
- https://dewotuf.files.wordpress.com/2020/06/12996268964.pdf
- https://xokiwija.files.wordpress.com/2020/06/wakopufal.pdf
- https://solotimo.files.wordpress.com/2020/07/24440555556.pdf
- https://dewufuvep.files.wordpress.com/2020/06/fodubufo.pdf
- https://xezaguduta.files.wordpress.com/2020/07/11677221258.pdf
- https://xizipif.files.wordpress.com/2020/06/siluromudimijuwaroro.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00007785.bin` `c5a93b0c4e5cc445ff9d581b41a63434cad89cadeb7ee7cd84e5c94180c9b7b8`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7785	5520 bytes
`font_01_sfnt_off00008a46.bin` `b0fbe41e04d182110cea5e382b7fcc8c6fe4b3bc3610ceb73bb524e9c2bb2ce1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8A46	10024 bytes

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