PDF malware analysis — malicious · 67f6e31c98695292

MALICIOUS

PDF

46.8 KB Created: 2020-08-31 19:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 37eb0bb4fec62919c47e67618ee9e394 SHA-1: 9f409b90dbf176a8571db44f2ce31900b45985af SHA-256: 67f6e31c98695292ed144d786afd4b67dc7b62da967e5f59e22d303d750b5446

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded external links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm, suggesting an attempt to manipulate search engine results or redirect users to potentially harmful 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.me/pify?keyword=vaso+campaniforme+ciempozuelos
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/1f2646_52c5e89dc8c5406bb412a8dcbce060ce.pdf
- https://static.usrfiles.com/ugd/3b0c81_f83927bc8e334c6c818920be13b7e05c.pdf
- https://static.usrfiles.com/ugd/1c8c6c_a69af4eb24d64a49a86b72ea99939284.pdf
- https://static.usrfiles.com/ugd/3bf302_48b3aa08395c4a35be7b7b8ae5eb1edc.pdf
- https://static.usrfiles.com/ugd/b8c837_729d691f03ea498285c983a66500103a.pdf
- https://static.usrfiles.com/ugd/b8c837_8a1051f93a97403fbf82fefb01b3a263.pdf
- https://static.usrfiles.com/ugd/b8c837_5c3f0db402aa4661add6d593c1d3be1b.pdf
- https://static.usrfiles.com/ugd/93c935_46c78ba609b94c6fb74f7e03ec12d84b.pdf
- https://static.usrfiles.com/ugd/895bef_f32da5ec353c4e1a8047889cc6790587.pdf
- https://static.usrfiles.com/ugd/b8c837_b30317aaa5564d66978070745cb83036.pdf
- https://static.usrfiles.com/ugd/b8c837_22406a0802ac4a48bad1ab99446b413f.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/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00007777.bin` `1d1b11c83efe329015aca3ac3810de24afcacf77b06c0816b931c11028aa2528`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7777	5176 bytes
`font_01_sfnt_off0000890a.bin` `93dde507df6ea97761e6d856ef39958a12552c45ae5dee665af8c8ec681cc1bf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x890A	11128 bytes

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