PDF malware analysis — malicious · 0b7899303d5719c0

MALICIOUS

PDF

41.3 KB Created: 2020-08-31 10:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 9c2f07ef3e455cad2076da3a4e4ffd0b SHA-1: 37ce3f06ba6990eab4a374c14bcb1280f905c297 SHA-256: 0b7899303d5719c0753b556915530e08c3d2d266e28486f0a90eaa8f523962fb

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains URLs that are part of a link farm, suggesting an attempt to drive traffic to malicious sites, likely for phishing or malware distribution.

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.cc/wix?keyword=graficar+funcion+discreta+matlab
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://cdn.shopify.com/s/files/1/0454/7280/9126/files/nekux.pdf
- https://cdn.shopify.com/s/files/1/0432/0431/3247/files/microsoft_azure_interview_questions.pdf
- https://cdn.shopify.com/s/files/1/0431/8865/0135/files/spring_boot_activemq_artemis.pdf
- https://cdn.shopify.com/s/files/1/0430/7727/1703/files/60647940151.pdf
- https://static.usrfiles.com/ugd/22739b_d9d8460d1ae5449fafb09616a23abc57.pdf
- https://static.usrfiles.com/ugd/b8c837_05e16d92375440af8840900285ca3e79.pdf
- https://static.usrfiles.com/ugd/162fe6_f7b2fdd93bfd4e10b60926897ce23df3.pdf
- https://static.usrfiles.com/ugd/760101_47c09f5fbb484cbb8f7b8024bb1e853d.pdf
- https://static.usrfiles.com/ugd/b8c837_41d861efb37249c79c5cdb82e032f555.pdf
- https://static.usrfiles.com/ugd/07e02c_690b5417abb041d4a2f54416de40cca6.pdf
- https://static.usrfiles.com/ugd/9734e7_0fdbce4c117a4d4689c9d416363b76e9.pdf
- https://static.usrfiles.com/ugd/b8c837_33ace708e8524835b9e9b6d815723726.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_off00005efd.bin` `4b298a13cb7d6f4d6b84cf5869980bf5245f324879a739031d13989e27cda098`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5EFD	5336 bytes
`font_01_sfnt_off0000710a.bin` `b7fb9baa4a9c96974e8a8ee3368d30bd87480e58fee1ee889ed863c9d97bb878`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x710A	11916 bytes

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