PDF malware analysis — malicious · b89c4b1a481d1324

MALICIOUS

PDF

40.8 KB Created: 2020-09-01 00:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: e3d09629e57a58b99c1f97e3cc14bcc4 SHA-1: 85f22a8070bdbb0bdc4586f3ac24112cd33bd1a0 SHA-256: b89c4b1a481d1324de9fef415f05af5669233018b86d7d57f74bf89342b854aa

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same text as the malicious URL's keyword parameter, suggesting a lure. The ML classifier also strongly indicated maliciousness. The PDF also contains a large number of links to external PDFs, likely for SEO manipulation to improve search engine ranking for malicious 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/wix?keyword=fried+catfish+nutrition+information
- https://static.usrfiles.com/ugd/b8c837_7f598550e17d4b59a95388f01a911b41.pdf
- https://static.usrfiles.com/ugd/07e02c_7aca991e9d6b4e1e907b9e037a736a17.pdf
- https://static.usrfiles.com/ugd/dfb5f8_5831f6382fc74b3b92e8b0fe2b45a3c2.pdf
- https://static.usrfiles.com/ugd/d9d1f5_9714e2c5e00c4ee4a74ad77823b681e5.pdf
- https://static.usrfiles.com/ugd/91e123_ff778a5069f9483ba16f064a3863a124.pdf
- https://cdn.shopify.com/s/files/1/0430/9798/1085/files/xojibujovanuwi.pdf
- https://cdn.shopify.com/s/files/1/0429/1218/6531/files/77653149891.pdf
- https://static.usrfiles.com/ugd/221f3a_e06c801cb4e149c8aa41921f76822c08.pdf
- https://static.usrfiles.com/ugd/b8c837_2968bec767fc414990ff7115e05a105f.pdf
- https://static.usrfiles.com/ugd/a298ce_f040973e6ca34a5c83703dd755217513.pdf
- https://static.usrfiles.com/ugd/b8c837_15391b1509634ac7be1bed88aeae6e23.pdf
- https://static.usrfiles.com/ugd/b8c837_e7110c20f72341d9a60270351c8b1b8c.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_off000062b2.bin` `5e6cf755674d2ec6f7bafdccab42021921df504be998a04aa04c96baf7d7a81b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x62B2	5184 bytes
`font_01_sfnt_off00007433.bin` `467cb4f6b56acd38c5793d62b9c4ae65265df7c129d3e89fb4c5001ebd52665b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7433	10024 bytes

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