PDF malware analysis — malicious · b85b7b942e74744a

MALICIOUS

PDF

48.9 KB Created: 2020-08-30 04:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 11d85255cf0abf4ccc70b01456f8d158 SHA-1: 3d2bb5fb6aebe8c29cc0019d3eb553d74d7f128d SHA-256: b85b7b942e74744ac339716fbcc2638771d6024a9f9ad9e1ab94822ab026b8dd

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The embedded URL, 'https://ttraff.com/wix?keyword=mccormick+tribune+campus+center+hours', is presented as a lure related to campus center hours, aiming to trick the user into clicking it.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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.
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
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=mccormick+tribune+campus+center+hours
- https://static.usrfiles.com/ugd/5ad03d_e025a2bfd36f426e9442a90f7c125aa9.pdf
- https://static.usrfiles.com/ugd/b8c837_21106e17e4e34c569abac13d06c60374.pdf
- https://static.usrfiles.com/ugd/b8c837_32e61ae4a0ef43f6b939f1d1bb80e266.pdf
- https://static.usrfiles.com/ugd/ca300b_15adc37752564ecf960c6ee5a135a5d8.pdf
- https://cdn.shopify.com/s/files/1/0440/4704/0662/files/gapokemokebenasevajikut.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pufabupenidobuxix.pdf
- https://cdn.shopify.com/s/files/1/0435/9559/5938/files/2432935888.pdf
- https://cdn.shopify.com/s/files/1/0435/3386/1018/files/10337227353.pdf
- https://cdn.shopify.com/s/files/1/0440/0054/2878/files/51405491244.pdf
- https://static.usrfiles.com/ugd/b8c837_a8d42a2cdc334486ab30289d205be209.pdf
- https://static.usrfiles.com/ugd/4b7290_4f12beaece674e3cab3705d66a964ce8.pdf
- https://static.usrfiles.com/ugd/353d00_f15fd580a5b34c44bd3dcbed9d9e182f.pdf
- https://static.usrfiles.com/ugd/f65518_02795a322d4449e7b930e1a0d4372196.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/
- https://cdn.shopify.com/s/files/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000828d.bin` `9f004869ddcef616a6bc429b3edefe622f65a5fcb02d64b0e2af9ad0a5e4890d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x828D	5348 bytes
`font_01_sfnt_off0000948f.bin` `b65a207fbcbfbefb6249bf2bdbcdcf18e36ddb0fbb36e72202eb283d9acc2dd1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x948F	9936 bytes

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