PDF malware analysis — malicious · 9c90c60447cf751c

MALICIOUS

PDF

34.2 KB Created: 2020-09-01 10:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 313a63c90e337ef8f78f541cbe78b8ef SHA-1: 74035323b2dc54964b59da1372e0af910a36e623 SHA-256: 9c90c60447cf751c64af29d6dbed8c60a51222557a1d46036a7f2792424e22d1

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.cc, disguised as a ukulele chord sheet. This indicates a social engineering attempt to direct the user to malicious infrastructure. The PDF also contains a large number of embedded links, many pointing to static.usrfiles.com, which is flagged as a link farm. The ML classifier 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=house+of+gold+ukulele+chord+sheet
- https://static.usrfiles.com/ugd/2486b5_4b7ed6a6565d4bc9a3486f19748c4d62.pdf
- https://static.usrfiles.com/ugd/3d0627_e76aa30fe2ce4e3d99db2acd6d59624e.pdf
- https://static.usrfiles.com/ugd/b8c837_07d0c78823af452eb49be98f48523b22.pdf
- https://static.usrfiles.com/ugd/b8c837_778064ffdee04353abbbbfaab9dbc789.pdf
- https://static.usrfiles.com/ugd/44b221_a474ad2f8980487eb88c005d3570d489.pdf
- https://static.usrfiles.com/ugd/b8c837_e1392cf124544ada8d2b309ecddaf9ff.pdf
- https://static.usrfiles.com/ugd/cb2bed_f487c3f0a5dc497a94d86b5c3205cb0a.pdf
- https://static.usrfiles.com/ugd/09273f_7b1a9267beb74c5d88c8e3c632f21163.pdf
- https://static.usrfiles.com/ugd/ab0441_d58f2fb91d2543d9b6492c822d6d4ec0.pdf
- https://static.usrfiles.com/ugd/6260fe_a09781f391a742a9b9ef072bb15ab88f.pdf
- https://static.usrfiles.com/ugd/909b15_b9715509b44c45869cb97dbaf163c298.pdf
- https://static.usrfiles.com/ugd/865d50_ef8b8ff5d1784a829ed8b43c4f48295a.pdf
- https://static.usrfiles.com/ugd/8127dd_c4452ff688b547968b5a38a7ae75b1fa.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_off0000485e.bin` `3db3418380d42f283bf83c9a84b766070476e7ae3916b05424e9496deb853af6`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x485E	5096 bytes
`font_01_sfnt_off000059b4.bin` `5001acf175a4b7d738af3c7e75a36898330c47ea00024817453d2a6b0ac682bf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x59B4	10052 bytes

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