PDF malware analysis — malicious · 56f26a759994e486

MALICIOUS

PDF

54.9 KB Created: 2020-08-03 01:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: b15a311c7725f7da6037028ff1809f3d SHA-1: b9768e2d6af046e1715befc31d33ab0b85433251 SHA-256: 56f26a759994e48613ffb83c2fb838585dfb7c51204e596753c994d47b7cfdbd

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous links, many of which are part of a link farm designed to improve search engine rankings. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is disguised as a link to a calculus textbook PDF. This suggests a social engineering attempt to trick users into visiting a malicious site. 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.com/pify?keyword=essential+calculus+early+transcendentals+1st+edition+pdf
- http://files.mrsolden.com/uploads/1/3/2/6/132682684/9800698.pdf
- http://files.silverstatemustangs.org/uploads/1/3/1/3/131378776/nerebimem-susuw-bonunonuzinod-visigusin.pdf
- http://files.iwanttobeanengineer.com.au/uploads/1/3/1/3/131380305/pobudegataxuwe.pdf
- http://files.stillnessinmovement.com/uploads/1/3/1/4/131453255/witofurelonesan.pdf
- https://cdn.shopify.com/s/files/1/0427/4031/8375/files/85606177453.pdf
- https://cdn.shopify.com/s/files/1/0434/4014/4534/files/1031048500.pdf
- https://cdn.shopify.com/s/files/1/0435/2393/2311/files/nitofu.pdf
- https://cdn.shopify.com/s/files/1/0431/1279/2221/files/82241322764.pdf
- https://cdn.shopify.com/s/files/1/0428/1407/9143/files/24771718342.pdf
- https://cdn.shopify.com/s/files/1/0437/2961/7057/files/pevivup.pdf
- https://cdn.shopify.com/s/files/1/0435/9087/7339/files/depomoka.pdf
- https://cdn.shopify.com/s/files/1/0429/7788/6367/files/64902491146.pdf
- https://cdn.shopify.com/s/files/1/0431/4864/0418/files/dozidivipujet.pdf
- https://cdn.shopify.com/s/files/1/0430/0292/1111/files/fidalinegubomekatow.pdf
- https://cdn.shopify.com/s/files/1/0433/4324/9563/files/tosudofewakonototakixum.pdf
- https://cdn.shopify.com/s/files/1/0438/3644/0733/files/52179539758.pdf
- https://cdn.shopify.com/s/files/1/0434/4011/1782/files/rurogofuzuxaluwedidivofez.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9284441163.pdf?v=1594212706
- 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_off00008dc0.bin` `5f5c62f36e79d8bca4ef089172dc2a4fa17826c9059cc99c75a14b6fef416ad0`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8DC0	5260 bytes
`font_01_sfnt_off00009fc2.bin` `7c50185e10e727a63ea20edfcbb5fba3b961812bdfcd4c49fd465c635b886fcc`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9FC2	14916 bytes

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