PDF malware analysis — malicious · a169891d056ab8e7

MALICIOUS

PDF

37.1 KB Created: 2020-09-06 05:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 9f43bcdca6dd34e33fc01cc3ea638c9b SHA-1: 3bd24f4e785c9a2f7ef607f03f360ac949386d83 SHA-256: a169891d056ab8e7fe0c49cfd119572d6169f88cad4845efc4d11880dda55e69

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.link/wix?keyword=clarinet+easy+sheet+music', is designed to redirect users to malicious infrastructure. The PDF also contains a large number of external links, many pointing to static.usrfiles.com, suggesting a link farm or SEO poisoning attempt to mask the malicious redirector. The ML classifier strongly indicates maliciousness.

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.link/wix?keyword=clarinet+easy+sheet+music
- https://static.usrfiles.com/ugd/6116da_d7b4761b8248449991ae5b0566c1f207.pdf
- https://static.usrfiles.com/ugd/76156b_8fa2594bafdd4f2aa4304585596d82ed.pdf
- https://static.usrfiles.com/ugd/0a84ca_e69195f282dc409a9348250c7967ec38.pdf
- https://static.usrfiles.com/ugd/d2cc1f_3a027692802c4ec59e6f6ff7c70b288c.pdf
- https://static.usrfiles.com/ugd/a9e086_84156cfa26134ef7889698e54f15f758.pdf
- https://static.usrfiles.com/ugd/756799_ef810880d0fc4d4b9c2b847fe797792d.pdf
- https://static.usrfiles.com/ugd/b8c837_b5cb405eec374da292893a431cdc0498.pdf
- https://static.usrfiles.com/ugd/a42eed_5b1cf48435fb412aaf47b13da02df667.pdf
- https://static.usrfiles.com/ugd/5899d5_ac8cd2b680f24c8eb611d9cc8e4a30f0.pdf
- https://static.usrfiles.com/ugd/008e52_8982820da8204457b606d5046ebffa0e.pdf
- https://cdn.shopify.com/s/files/1/0460/5643/9963/files/videocon_d2h_application.pdf
- https://cdn.shopify.com/s/files/1/0436/9104/9115/files/50994850734.pdf
- https://cdn.shopify.com/s/files/1/0430/3116/7137/files/77937907314.pdf
- https://cdn.shopify.com/s/files/1/0448/2295/4141/files/eugen_bohm_bawerk.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_off00005471.bin` `23f274a00adc5bcb9324431c198cfdfa7c843eb1ee8ba3a0d7bd0d4e53017504`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5471	5044 bytes
`font_01_sfnt_off00006572.bin` `eedf450d9906530ee26d95fe17b7c5ab4259e06315c97f02d6d957a3b689440f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6572	10048 bytes

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