PDF malware analysis — malicious · 946f9b6392cdbc5f

MALICIOUS

PDF

49.2 KB Created: 2020-09-01 21:39:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 2b4bf182a4f29cc6641c9de1f796bec8 SHA-1: 0b5f923d5987ba01945819373d9766239406f859 SHA-256: 946f9b6392cdbc5f255d447f564dfb59adac3303d5af3a02e7e53076143c4f21

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it points to known malicious infrastructure. The document body, though heavily obfuscated, contains a URL that matches the redirector. This suggests the document's primary purpose is to redirect users to a malicious website, 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.com/wix?keyword=autobiography+books+free
- https://static.usrfiles.com/ugd/a6e5e9_e1348e297eec4e629bb9575e8fbeee0b.pdf
- https://static.usrfiles.com/ugd/b8c837_585aec33e6074c008a1718695b2452eb.pdf
- https://static.usrfiles.com/ugd/451461_7c35b5b640f0447fb12086387c3dce22.pdf
- https://static.usrfiles.com/ugd/df73ab_9bb42c4382d24539b658653600049b5b.pdf
- https://static.usrfiles.com/ugd/81d6a4_69e505081e974e44847d644828e75104.pdf
- https://static.usrfiles.com/ugd/eed56f_e0fb876a03db4412b53ff402cfb493cb.pdf
- https://cdn.shopify.com/s/files/1/0431/9812/0096/files/39356918514.pdf
- https://cdn.shopify.com/s/files/1/0437/1143/0809/files/68897638890.pdf
- https://cdn.shopify.com/s/files/1/0461/7450/3065/files/nom_04_expediente_clinico.pdf
- https://cdn.shopify.com/s/files/1/0429/2981/5705/files/jirexunixekesoxe.pdf
- https://cdn.shopify.com/s/files/1/0428/1604/5222/files/alergia_a_picadura_de_abeja.pdf
- https://cdn.shopify.com/s/files/1/0432/7420/7387/files/zatewejepi.pdf
- https://cdn.shopify.com/s/files/1/0431/5329/3469/files/geguwubuxodad.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_off0000821c.bin` `8d37b24dc5d1147c11d5eba938fbaf4b20f12b7b20fccd36fb67c82477ddc5c9`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x821C	5428 bytes
`font_01_sfnt_off00009497.bin` `de09027f5d71cf944db37f0b16d10b17002b522220f58738d2603cf84b4c656c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9497	10388 bytes

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