PDF malware analysis — malicious · a2c58b47d3617177

MALICIOUS

PDF

39.2 KB Created: 2020-08-29 17:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 349d9507f17c0f2fddf652ac9b906394 SHA-1: fb578d43a69173adbba79a7ec64b94174adbbe88 SHA-256: a2c58b47d361717751aeff27ea962d5516ae60db62bfe1f7402f8ed989c77230

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body and embedded URLs reveal a link farm strategy, with the primary malicious URL being https://ttraff.ru/wix?keyword=hd+sentinel+portable+full. This pattern suggests the PDF is used to lure users to potentially harmful sites, likely for phishing 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/wix?keyword=hd+sentinel+portable+full
- https://static.usrfiles.com/ugd/b8c837_0700ccf4ea9a4828ad733b37440333e5.pdf
- https://static.usrfiles.com/ugd/b8c837_5a77fbba861a436f9ccbe225fd91bce4.pdf
- https://static.usrfiles.com/ugd/b8c837_cf7e75be42e84fb39461b4b2bf6d0847.pdf
- https://static.usrfiles.com/ugd/b8c837_69a316af0b9741f3b895e20241c63092.pdf
- https://static.usrfiles.com/ugd/b8c837_ac4be774ca5b438e9e2f23ee1d73a232.pdf
- https://cdn.shopify.com/s/files/1/0428/2246/7750/files/gikej.pdf
- https://static.usrfiles.com/ugd/b8c837_ac4ae4e6b6ab4d6f94bbec9ae23583d6.pdf
- https://static.usrfiles.com/ugd/b8c837_a20dfa2f5b354ac8b95b41c6260479c1.pdf
- https://static.usrfiles.com/ugd/b8c837_1b6bd161226a46328be13afeb8103991.pdf
- https://static.usrfiles.com/ugd/b8c837_3716386159e84bb3a521068b19b856cb.pdf
- https://static.usrfiles.com/ugd/b8c837_c3ae09e087aa487a9991ec7759c3ef61.pdf
- https://static.usrfiles.com/ugd/b8c837_4f103243ff8346f791e0928d59f9e370.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_off00005cd8.bin` `7267900214ae564cb02ef9525aa4ca3daa0d10bded69cddb51535794d9618b02`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5CD8	5136 bytes
`font_01_sfnt_off00006e4e.bin` `803b6a42c9887d90f2b5e07cbc0e38e6f6a0377dd1e61eda3230daf12f95596e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6E4E	10004 bytes

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