PDF malware analysis — malicious · 311e6c0f1bb7b137

MALICIOUS

PDF

36.0 KB Created: 2020-08-30 05:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 0a14a9ff88f49a7941f9ffe3c0c2b32f SHA-1: 07c7d09d70a9741f6fee99126fb98921712058a9 SHA-256: 311e6c0f1bb7b137f554e78a5f0e5593fc3446f7f88f52e059896040c033ca27

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=subject+and+object+questions+exercis'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains the same suspicious URL, suggesting a lure to a malicious site.

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.ru/wix?keyword=subject+and+object+questions+exercis
- https://static.usrfiles.com/ugd/b8c837_5ebc31fccf7147f5b53ae8a6e3b817d9.pdf
- https://static.usrfiles.com/ugd/0a0016_4da3d1443b6d4807a3ff148a36d1877b.pdf
- https://static.usrfiles.com/ugd/cfbfd2_79ac1335b37d42bcad760c7cc32bc9a6.pdf
- https://static.usrfiles.com/ugd/6240f8_db626d2a934b4f6dab007ccf02eaa628.pdf
- https://static.usrfiles.com/ugd/b8c837_06e809e4fc31494ea0b6ed5c3044aae4.pdf
- https://static.usrfiles.com/ugd/599026_0c7618762e0f42c48b0510dd01bc1751.pdf
- https://static.usrfiles.com/ugd/b8c837_4a8e8b88ce3f42ecaa4fc7149577fd9a.pdf
- https://static.usrfiles.com/ugd/b8c837_79255ba27a094f91bebf1333f8f4f0af.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/69651331918.pdf
- https://cdn.shopify.com/s/files/1/0430/4257/0402/files/varoxugu.pdf
- https://static.usrfiles.com/ugd/804ff6_e26673ea017b4bcdb7a8093e8b9c5acd.pdf
- https://static.usrfiles.com/ugd/b8c837_f0d9ea0f57004c04b51958ec8cf844ae.pdf
- https://static.usrfiles.com/ugd/3e87bf_622390183e014798b81ea4c2391e44b8.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_off00004d4e.bin` `79527d92849a794baceb2befb30aec1b169dea0433454322728677773996a656`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4D4E	5412 bytes
`font_01_sfnt_off00005fc2.bin` `ddad09b5a4febb9cfc8f403c15bbba9a9fd8d73a885747db7475de1368b21454`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5FC2	10376 bytes

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