PDF malware analysis — malicious · 3b2e5d3f59fc1782

MALICIOUS

PDF

47.7 KB Created: 2020-09-01 20:40:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: aee80563e4b781e77a3db69748b91d26 SHA-1: b921e1f4430566e93d530d850b38ba33739241d1 SHA-256: 3b2e5d3f59fc17825b87d02e48a70556dde99df1ee2d1c4889e263e6f17b851e

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, pointing to 'https://ttraff.com/wix?keyword=chomsky+normal+form+epsilon'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The embedded document body text, though partially garbled, contains the malicious URL and appears to be a lure related to 'Chomsky normal form'.

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.com/wix?keyword=chomsky+normal+form+epsilon
- https://cdn.shopify.com/s/files/1/0432/4684/6107/files/borupexesidadu.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/palafasejuzanuz.pdf
- https://cdn.shopify.com/s/files/1/0434/0783/5292/files/evangelismo_personal.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/74133662670.pdf
- https://cdn.shopify.com/s/files/1/0437/4616/4897/files/88025724.pdf
- https://cdn.shopify.com/s/files/1/0430/4958/2743/files/zokedekubusofes.pdf
- https://cdn.shopify.com/s/files/1/0436/2525/0974/files/allen_carr_stop_smoking_now.pdf
- https://cdn.shopify.com/s/files/1/0429/2942/2499/files/apush_give_me_liberty_chapter_24.pdf
- https://cdn.shopify.com/s/files/1/0431/6404/1365/files/86057732676.pdf
- https://cdn.shopify.com/s/files/1/0435/7079/0558/files/wudujedemijabebib.pdf
- https://static.usrfiles.com/ugd/69695d_a8ad3f20bcb245e08f1501489f53794d.pdf
- https://static.usrfiles.com/ugd/345929_1bd1b84fe1314663b835c139b348e440.pdf
- https://static.usrfiles.com/ugd/b8c837_fd78d30831c44b54afee094af1d5ca48.pdf
- https://static.usrfiles.com/ugd/b8c837_fcb433e9ff0a4f59a0c432f3d3771bc9.pdf
- https://static.usrfiles.com/ugd/b8c837_b123b9d35bee43a28bac04eb065e97d7.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_off00006639.bin` `b30de9b25e50a6e04f69389b5c94694dc28882c9220ec6574ead74aa13a9cb7a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6639	5212 bytes
`font_01_sfnt_off000077c8.bin` `a7e057c75361448b11bb9d435b8bfd5b79719b0c5b3730c1e18f7313c9292cee`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x77C8	10764 bytes
`font_02_sfnt_off00009cb4.bin` `be35776a494009fff507c08a9b82335afe09b1329e773a2b3947f9115115db20`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9CB4	16148 bytes

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