PDF malware analysis — malicious · 532c9543799b69a1

MALICIOUS

PDF

44.2 KB Created: 2020-08-30 10:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: f5ab49f2fd618917c2cbe9dfec9405cc SHA-1: 4690892994ad8ef092319ec990d821e4b25d4d5f SHA-256: 532c9543799b69a1b45f86eccbae8b4a69d65b86a96c2d9d61c228487d43bf4c

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm, with the primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same search query as the malicious 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 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.cc/wix?keyword=perkins+4+cylinder+diesel+engine+man
- https://static.usrfiles.com/ugd/b8c837_337896b70c954961bb4fec53f7b53413.pdf
- https://static.usrfiles.com/ugd/d3758e_3480df07627245f7a463d1dde447b49d.pdf
- https://static.usrfiles.com/ugd/0fdb6d_5b27bb57d89040f781afd894b37f50e5.pdf
- https://static.usrfiles.com/ugd/764aaa_b2a512196f30493d9beb9f7ec69967e2.pdf
- https://static.usrfiles.com/ugd/b8c837_dc86ab8a4433493baa4009303d39af6d.pdf
- https://static.usrfiles.com/ugd/b8c837_6314df16633e4e0c801d3cb843717bfe.pdf
- https://static.usrfiles.com/ugd/b8c837_22c8f66e946143e9855b697226fce7f0.pdf
- https://static.usrfiles.com/ugd/824332_778134755d6e4e50a95ba2b074272f1c.pdf
- https://static.usrfiles.com/ugd/9dda13_db075291e9474fd7b80fb75fb0d8c36d.pdf
- https://cdn.shopify.com/s/files/1/0430/1327/5811/files/64330535225.pdf
- https://cdn.shopify.com/s/files/1/0437/4275/7029/files/zafifewadulila.pdf
- https://cdn.shopify.com/s/files/1/0438/9725/8136/files/bijogunu.pdf
- https://cdn.shopify.com/s/files/1/0430/0845/8905/files/wijoxigudubeduwi.pdf
- https://cdn.shopify.com/s/files/1/0431/0089/7440/files/ziwimetavik.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_off00006d42.bin` `4a86c5a2862673c293c3fd48787f1c683ceb41cd0b91cb181dac76553a2e17e6`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6D42	5512 bytes
`font_01_sfnt_off00007fed.bin` `50465be4281c6a11cb3f31d03666029d51c07b09ca8f84907930e8d9abff4778`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7FED	10612 bytes

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