PDF malware analysis — malicious · 59dc4fce5a73dd7f

MALICIOUS

PDF

42.3 KB Created: 2020-09-04 20:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: c8bdfcd613233a627cce0b053f1c0413 SHA-1: f761667499005a7edbca066cc614eb71b104aa2a SHA-256: 59dc4fce5a73dd7f3a0fd7cc191c6191c315305fb7d4a53fc6b40023a557a0f8

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm with numerous embedded URLs, many pointing to Shopify domains, likely for SEO manipulation. The primary malicious URL, https://ttraff.club/wix?keyword=business+computer+information+systems+salary, is identified as a redirector to malicious infrastructure. The document body, though heavily obfuscated, contains this malicious URL, indicating an attempt to lure the user into clicking it. 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=business+computer+information+systems+salary
- https://static.usrfiles.com/ugd/fb5067_27d76c74863d458d8ab9c340b3fd290e.pdf
- https://static.usrfiles.com/ugd/32acb1_56d8872782bc40abb13fc3e40a198179.pdf
- https://static.usrfiles.com/ugd/01e791_3ee5b5559ad44f89a46d0ca1f1b7e1d5.pdf
- https://cdn.shopify.com/s/files/1/0437/5012/9813/files/59461094371.pdf
- https://cdn.shopify.com/s/files/1/0430/6839/1577/files/cognos_tutorial_for_beginners.pdf
- https://cdn.shopify.com/s/files/1/0437/4655/8106/files/dryer_sheets_mice_car.pdf
- https://cdn.shopify.com/s/files/1/0431/6869/4423/files/96292695514.pdf
- https://cdn.shopify.com/s/files/1/0433/1284/0872/files/71818649558.pdf
- https://cdn.shopify.com/s/files/1/0434/5895/3369/files/zuwuzovaparujuser.pdf
- https://static.usrfiles.com/ugd/1849a1_273a08187671455a889128187863523c.pdf
- https://static.usrfiles.com/ugd/9d66c7_f3476e1bdadd4b4a938f0cf2a7f11bdb.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_off00006021.bin` `e4118cfbf39eb6b8050a233b036c585137842372b9f1b6229fa0d3b3ab4e9269`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6021	5312 bytes
`font_01_sfnt_off00007227.bin` `4d6a5e70874c3a6cff88b449880d634bd43327c95abc2f9fccddaeea992dc3f3`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7227	13356 bytes

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