PDF malware analysis — malicious · 3c2f7908ef388897

MALICIOUS

PDF

52.5 KB Created: 2020-09-01 22:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: c5f4757f6635aad6d07b926651b637a6 SHA-1: 343da8cb290de8bcf3cf05da8fae3f77131100e9 SHA-256: 3c2f7908ef3888978ffc92b9e2653988736468097440fad5f53a1c794222c5cc

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links. One of these links, https://ttraff.cc/wix?keyword=applied+sciences+information+systems+inc, points to a known malicious redirector. The presence of a large link farm suggests an attempt to manipulate search engine results or distribute malicious content through numerous external links.

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=applied+sciences+information+systems+inc
- https://static.usrfiles.com/ugd/b8c837_7cda6eb667ad437ca740bd61b864e9b8.pdf
- https://static.usrfiles.com/ugd/ae15ca_084f806e598040f4be137fe799d0bc3e.pdf
- https://static.usrfiles.com/ugd/b8c837_0936679e5e8f45da934086d05a081a7a.pdf
- https://static.usrfiles.com/ugd/9b5f63_5e813e3f65da491e8f0188c0cf5f9b0f.pdf
- https://static.usrfiles.com/ugd/15ebe2_83aa8c2f7cd344caba5b9e20966e7f9d.pdf
- https://static.usrfiles.com/ugd/b8c837_0477fee2ee2e4f7086ad927eaeb3ddf1.pdf
- https://static.usrfiles.com/ugd/b8c837_05c51dcbf4d74074a459d27da6beca0b.pdf
- https://static.usrfiles.com/ugd/191a6d_02a2d3bd7308464099d7f3c90de363d3.pdf
- https://static.usrfiles.com/ugd/9904c2_7538bf49cba5404c8c039cd6d65a04cc.pdf
- https://static.usrfiles.com/ugd/bfbc46_8d57dc0c6de84930a7a8ddbffb6c7d6e.pdf
- https://static.usrfiles.com/ugd/1df9ea_e1286dc1d12e4fc680e41b95824262f0.pdf
- https://static.usrfiles.com/ugd/c1c462_cd5fcf037e6b4e95a02fe4df5c125171.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_off00008dd0.bin` `20258a7e5f3200a087c46907660eba8f8f9f0dcfcb017622541f5c7c9ad0c6dd`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8DD0	5392 bytes
`font_01_sfnt_off0000a01c.bin` `20cb043984a6212dcb4dd47e3e335f1ef2159dfda79c6c555c12d570ce2fbc00`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA01C	11096 bytes

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