PDF malware analysis — malicious · f525bff49335eb88

MALICIOUS

PDF

40.2 KB Created: 2020-09-04 16:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 1182c00cf700ee44ebf2733b80b1e0b3 SHA-1: d11b1666435ea1fa90fe594d823f028147d8f946 SHA-256: f525bff49335eb88bae44f731b6ddffb1967508e8744d8e4fb0c3ade2d2eaacd

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm hosted on static.usrfiles.com. One prominent link, disguised as educational material, redirects to a malicious domain (ttraff.club). This indicates a social engineering attack aimed at redirecting users to potentially harmful content. 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/pify?keyword=ncert+books+class+9+english+moments+pdf
- https://static.usrfiles.com/ugd/77941b_e56ce693a57446baad273bfa8688a751.pdf
- https://static.usrfiles.com/ugd/b4a829_702cc51724384aceaccb0125237bc669.pdf
- https://static.usrfiles.com/ugd/19ce5d_49b9edeccd8a41518640168cfb18927d.pdf
- https://static.usrfiles.com/ugd/031dda_b428f092dcd34816802e15d84e3f70c1.pdf
- https://static.usrfiles.com/ugd/18f527_f95beff7d96d49d9b3dc547cf3b5fb7b.pdf
- https://static.usrfiles.com/ugd/0779a3_a9e0a539af3c4f5f9ad28c20b351a085.pdf
- https://static.usrfiles.com/ugd/b8c837_54b7dcf7a2be4aa09672ee1cf0f27ae1.pdf
- https://static.usrfiles.com/ugd/cbdbb6_839cf9d744c34ee1a57d78e7c7f6f6ef.pdf
- https://cdn.shopify.com/s/files/1/0438/8500/2920/files/gunuv.pdf
- https://cdn.shopify.com/s/files/1/0463/0341/2381/files/beautician_tunic_uniform_uk.pdf
- https://cdn.shopify.com/s/files/1/0434/0560/7070/files/fovekajazuxivubovu.pdf
- https://cdn.shopify.com/s/files/1/0431/8353/8331/files/hitman_blood_money_compressed.pdf
- https://cdn.shopify.com/s/files/1/0429/1641/3607/files/segifesaz.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_off00005e44.bin` `4f4141c2a5c8316cf0af9c1965fccbf20a2fec8ca099b49b49cac319f743fd92`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5E44	5900 bytes
`font_01_sfnt_off00007230.bin` `ec7cd6ab18420b706eb5f9ed87a11d5583b9361ba1418e21d8a7ec2c5e202058`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7230	9992 bytes

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