PDF malware analysis — malicious · 90602a0bd50be0d8

MALICIOUS

PDF

44.9 KB Created: 2020-09-19 09:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 9e83c2859ffda0230ccf1ba56c5bd206 SHA-1: ffcc469840cb266696198cde3c13065fd8407523 SHA-256: 90602a0bd50be0d8f0d28e8d790805c81cbfae91b464e160ac7a2aa67c9710ac

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a high number of embedded links, many pointing to external PDF files, a technique often used for SEO poisoning or to obscure malicious destinations. One critical heuristic identified a link to a known malicious redirector, 'ttraff.link', which is used to obscure the final malicious URL. The document body, though partially corrupted, contains text related to 'compound interest practice worksheet answers' and the malicious redirector URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly indicated 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=compound+interest+practice+worksheet+answers
- https://cdn.shopify.com/s/files/1/0429/3384/6172/files/big_ben_reformation.pdf
- https://cdn.shopify.com/s/files/1/0436/4104/5145/files/hollywood_movies_2013_tamil_dubbed.pdf
- https://cdn.shopify.com/s/files/1/0432/2865/9870/files/nodugifumiwogorafat.pdf
- https://cdn.shopify.com/s/files/1/0429/1392/3228/files/95643389973.pdf
- https://3d4d4cec-a8d1-441a-ac29-5f51a880ebf4.filesusr.com/ugd/696117_791a5705c21e497babafa4b5e2b889bf.pdf?index=true
- https://065f26d5-8bba-42b3-a66f-377e27dcf729.filesusr.com/ugd/430cb2_0927af37aa1149838206e12002387c62.pdf?index=true
- https://f4b88c91-05c8-4d30-b30f-c17e22451f32.filesusr.com/ugd/83b1b3_c540cc3030a6438f92f311f2fda67c92.pdf?index=true
- https://6536868e-bf10-471d-b578-d1514f08b432.filesusr.com/ugd/34ec99_8e068eba575b42b9904432fcf0cf8a5f.pdf?index=true
- https://ab2966c7-7dfe-4fa8-875c-6326d2f2bf86.filesusr.com/ugd/5c8b2f_e809912e253d4dbc931906cccacb9bad.pdf?index=true
- https://087748f1-f7cc-44dc-adfd-7e9e9ee4b51b.filesusr.com/ugd/97aff7_b79b8f92388240c29eb82ef246a5e99d.pdf?index=true
- 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_off00005b36.bin` `f83f766ad8f30fd5a34307e69625c3b739c5687d4c2777510d9b12fb301a681b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5B36	5340 bytes
`font_01_sfnt_off00006d41.bin` `6e45e3451046010318194ad7919df1202fe049c7520dccaecb76b00299a1ef71`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6D41	10256 bytes
`font_02_sfnt_off0000906b.bin` `317228f2d08d18141f034234d842b81bf2a15bd1d86e3bca52277fb9bcb4e4ca`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x906B	16380 bytes

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