PDF malware analysis — malicious · 9df6613e4d4770c0

MALICIOUS

PDF

38.6 KB Created: 2020-09-01 05:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 9e03852a5b09ac698360f3da21c9268c SHA-1: 5e8aac1cee89d59233b42ee97191d32a51daedae SHA-256: 9df6613e4d4770c0869b47c84fa04c2cfb8001eae0f89ee121c57bf807b4e74c

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wix?keyword=light+blue+school+uniform+shirt'. This URL is presented within the document body, suggesting a social engineering lure. The file also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many pointing to Shopify-hosted PDFs. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be directing the user to the malicious redirector.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 3

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.
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.ru/wix?keyword=light+blue+school+uniform+shirt
- https://static.usrfiles.com/ugd/c0b427_13a1ad14d0d946b9a93726d7f0e6e025.pdf
- https://static.usrfiles.com/ugd/3e9e83_08973a8b5a864b46b7c70c8fb76f50f3.pdf
- https://static.usrfiles.com/ugd/ce14f3_8941e882a2d84390994174ccb7b4d631.pdf
- https://static.usrfiles.com/ugd/0e9fc2_03093717e19a4e6ab91ae64acaa14565.pdf
- https://static.usrfiles.com/ugd/40512e_5ef4e1b01aa0435c9339ffc85dbe50ad.pdf
- https://static.usrfiles.com/ugd/b7ab08_9a963a3a0d0b4f72a06e7df7b0eb691a.pdf
- https://static.usrfiles.com/ugd/8e1900_976dc6e2629046e28b59c1ec574327d1.pdf
- https://cdn.shopify.com/s/files/1/0439/5591/2862/files/30429093286.pdf
- https://cdn.shopify.com/s/files/1/0434/0695/0550/files/chuyn_file_sang_word_online.pdf
- https://cdn.shopify.com/s/files/1/0431/0892/5600/files/principles_of_chemistry_a_molecular_approach_3rd_edition_free.pdf
- https://cdn.shopify.com/s/files/1/0430/9726/0192/files/rivumiwit.pdf
- https://cdn.shopify.com/s/files/1/0438/0036/3169/files/invite_for_meeting_email_template.pdf
- https://static.usrfiles.com/ugd/b8c837_1b0978d96f8c45b39f765347f84a02ea.pdf
- https://static.usrfiles.com/ugd/b8c837_b3ac721f6209430e97512b755d429ab6.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00004d44.bin` `325e002df2e7b63703ca5a19d265a1ca4fbe678ac191404bea7ff565b714209e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4D44	5048 bytes
`font_01_sfnt_off00005e4c.bin` `d38e287ed30250b2d120e4d6d110f871ec7cc526787b01489c2a38bf65ffef63`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5E4C	9184 bytes
`font_02_sfnt_off00007d8b.bin` `1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7D8B	4324 bytes

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