PDF malware analysis — malicious · ad9a8cba82ffdd88

MALICIOUS

PDF

41.7 KB Created: 2020-09-04 10:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 165ff94854b33d829d9fbd10defe9957 SHA-1: 6b45284bd113450a0d72617d5a5458ad9bb61e5e SHA-256: ad9a8cba82ffdd880cd0b2f84c13320745c32273cddcee2afbf6c93104e18aa5

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.me, which is disguised as a 'benevolent fund form'. The document body, though heavily obfuscated, also contains this URL. The presence of numerous links to static.usrfiles.com, while individually benign, contributes to a link farm pattern. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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.me/wix?keyword=benevolent+fund+form+2018+kpk
- https://static.usrfiles.com/ugd/b8c837_6328d2548b3c44889836de23ef385a86.pdf
- https://static.usrfiles.com/ugd/739437_a611f46f5dc64b43aa2d80e33ee65dc1.pdf
- https://static.usrfiles.com/ugd/536122_39bb5b5c339f42bc8462e66b0c6e719c.pdf
- https://static.usrfiles.com/ugd/fb83f1_e3464f19a9904a90aede541c275cbde8.pdf
- https://static.usrfiles.com/ugd/b8c837_c5c3eec5cda04c8e9819206fed996b30.pdf
- https://static.usrfiles.com/ugd/de02f3_8d60a673c4fd4144aa13d4e6519dbc64.pdf
- https://static.usrfiles.com/ugd/f4de5e_34f09ba437ee44b1a983a42e30f2bf3b.pdf
- https://static.usrfiles.com/ugd/8ff694_7bdaa1c3c0994515867e9aca503f8fbe.pdf
- https://static.usrfiles.com/ugd/9421c8_11794ee29d7744b787542177da3c7b0b.pdf
- https://static.usrfiles.com/ugd/7d1dc9_11f5f549f73248e5b6fb5b1712bd7e01.pdf
- https://static.usrfiles.com/ugd/5dc3ca_3689b44ac3f64d5ab55de0951a0a3013.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00004d9d.bin` `b3ccf121d9afb49b1cfab6a03199491465e07017c2d10f97f123be54485dfa59`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4D9D	5328 bytes
`font_01_sfnt_off00005fb8.bin` `95d84204c540713c1510470813f50948cad71a1a2e0e2091cbc99d83fc7ed9a7`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5FB8	14220 bytes
`font_02_sfnt_off00008c06.bin` `cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8C06	4324 bytes

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