PDF malware analysis — malicious · 3eb52b791b0371d7

MALICIOUS

PDF

49.9 KB Created: 2020-09-04 20:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: faed37c753dd8d4b820f72de9de578d6 SHA-1: ee70aa06247a5c454b6b8e64a77bf4effa33f82e SHA-256: 3eb52b791b0371d7d7558de1386579d8adf9f01c115e6acd147e0029c2679706

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to a link farm hosted on static.usrfiles.com, with one prominent link leading to a malicious redirector at ttraff.club. This suggests a social engineering attack designed to drive traffic to malicious infrastructure, likely for further exploitation or phishing. The ML classifier strongly supports the malicious nature of this 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/wix?keyword=test+angielski+poziom+b1+pdf
- https://static.usrfiles.com/ugd/7c30af_318015b9fe8a4ad8a44f8701ce514469.pdf
- https://static.usrfiles.com/ugd/2f7815_f4612218031242d59270c619bcdc920f.pdf
- https://static.usrfiles.com/ugd/a1fb72_13a029df3bc34197a7003bc75c918639.pdf
- https://static.usrfiles.com/ugd/99965f_a698fc67fed9451a890c2c3f8d7233cc.pdf
- https://cdn.shopify.com/s/files/1/0434/3100/2264/files/transformers_prime_arcee_x_reader.pdf
- https://static.usrfiles.com/ugd/d2751c_36b83f3426de40e3a419d21deeef5839.pdf
- https://static.usrfiles.com/ugd/b8c837_64ff54eb1c6c43e0a006ccc99c6f5e33.pdf
- https://static.usrfiles.com/ugd/c57cae_2a1ef7e7a3bf4e1e8756a3edcd545fb5.pdf
- https://static.usrfiles.com/ugd/3de8a6_3a8b814a6db042feb40ef8bba6e609c1.pdf
- https://static.usrfiles.com/ugd/b56239_7ff5437f3fe8487d94bff0d08cb56c83.pdf
- https://static.usrfiles.com/ugd/b8c837_2144100e9be34a09ba9a82ea531e3fca.pdf
- https://static.usrfiles.com/ugd/f515ca_fbcb30a0fcf642ebbc24bb74b08c5421.pdf
- https://static.usrfiles.com/ugd/6116da_a26d4af9db324e19a7dce3af693f7eb1.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_off00008261.bin` `3bec1aae6e56bf3ae8f0e9f20f6808000b709dec4c51506c74da569d5ff3652b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8261	5520 bytes
`font_01_sfnt_off00009525.bin` `098b2df47655c94866e4b661e63057286172dcbc9547f7febdf9b40699abaa11`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9525	11584 bytes

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