PDF malware analysis — malicious · 89fffb341283dd02

MALICIOUS

PDF

43.9 KB Created: 2020-09-07 09:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: dfda759193a75c5ab0487d23bdad85fd SHA-1: 0cbe0c67b2a965fca5f794fcdb1842837ce3beee SHA-256: 89fffb341283dd02c706c0c03e627a0bc283b384e2480e874dffe5c59ee91d58

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The presence of a link farm suggests an attempt to obscure the final malicious destination. The document body contains text related to 'Cactus y plantas suculentas pdf' and mentions 'wkhtmltopdf', which is likely a lure to disguise the malicious nature of the PDF.

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.club/pify?keyword=cactus+y+plantas+suculentas+pdf
- https://static.usrfiles.com/ugd/e3ed1f_01c673c6e2684b1684ba6da7dcdd7e76.pdf
- https://static.usrfiles.com/ugd/e4a001_a6f57608cca046688cbf52fce82444b9.pdf
- https://static.usrfiles.com/ugd/b8c837_8bc0202a14354e588fc094bff3d3c6d3.pdf
- https://static.usrfiles.com/ugd/451461_9094c79842554c6ab8b92461e10f5766.pdf
- https://static.usrfiles.com/ugd/daca0d_b89da41145984c9681918241cbedeffd.pdf
- https://static.usrfiles.com/ugd/1c8c6c_2b071f939c9e445b9d779ab011980ba1.pdf
- https://static.usrfiles.com/ugd/a8c229_5ad6507da9ef49f4822f55d19e30fb7e.pdf
- https://static.usrfiles.com/ugd/ac51ce_c5d9b6d59fa9475e9dbd1df3680094d3.pdf
- https://static.usrfiles.com/ugd/6fd45c_118dbe461f924b75963abcbca6426b46.pdf
- https://static.usrfiles.com/ugd/b8c837_332597f417a74a639b5834b8574d4b1f.pdf
- https://static.usrfiles.com/ugd/b8c837_12cdad824b15451aa7f3ac4998643da9.pdf
- https://static.usrfiles.com/ugd/625844_d7f416c97e0e424b9c55da8be4fd3502.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_off00006d8a.bin` `b874ee4381c6ef424ad452273c48f35d37064578d94d9b4cb8b0a9b2c569fe66`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6D8A	5060 bytes
`font_01_sfnt_off00007edc.bin` `6203ae1781d333bd0e821f6655d08c12debaad30b7eb500fa367652b69bebc6a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7EDC	10612 bytes

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