PDF malware analysis — malicious · cd0eb6ab1777d5c9

MALICIOUS

PDF

30.8 KB Created: 2020-08-31 03:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 20f1a0cc2bbb16cbd4ed44d22abeb6fd SHA-1: 9439179ab92ba8a096afeeefc7e0d8c65efbbbb2 SHA-256: cd0eb6ab1777d5c9c18e5fb1b8fe4b044e4e28dda95a175328690ecb46671260

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'mens health workout pdf'. The heuristic firings confirm the presence of malicious redirector links and a link farm, indicating a phishing or redirection attempt. The ML classifier strongly supports the malicious nature of the file.

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=mens+health+workout+pdf
- https://static.usrfiles.com/ugd/b8c837_39d35689cf7343b5be459bd2bf20f237.pdf
- https://static.usrfiles.com/ugd/739437_e7ffff860e524ca3b3ecb47fdc7a04d2.pdf
- https://static.usrfiles.com/ugd/b8c837_470c600901784a6480168fd239ba6a75.pdf
- https://static.usrfiles.com/ugd/6cfc61_1031cda437b94dc9859f1de55397e14a.pdf
- https://static.usrfiles.com/ugd/850f07_b23f24c5602647c2be62dac21aaa2cba.pdf
- https://cdn.shopify.com/s/files/1/0461/7548/6115/files/tnusrb_si_hall_ticket_2018.pdf
- https://cdn.shopify.com/s/files/1/0431/2412/9952/files/3557587286.pdf
- https://static.usrfiles.com/ugd/b8c837_a2ce1321d96c474b9124d5cca383466c.pdf
- https://static.usrfiles.com/ugd/01e791_37f7fda5d41347d1a29c4db03ee1bd04.pdf
- https://static.usrfiles.com/ugd/cc14e4_1d29b6449cf340c7a7205227ea8caece.pdf
- https://static.usrfiles.com/ugd/4d6844_64375935e722402a939d6c1b503da972.pdf
- https://static.usrfiles.com/ugd/b8c837_9c315e1065d446e2ae67cf8361e2fa41.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_off00003ed5.bin` `49f4bd077fb6aa9dc00a29ce05b49d9fdd4ace1fd97dfca5311b55343caf84d1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3ED5	5292 bytes
`font_01_sfnt_off000050e5.bin` `5391f58ef73027b9fd7694a28a615268f586c35f11f6d11c3f1a1640e469ba45`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x50E5	8792 bytes

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