PDF malware analysis — malicious · 4194ae9db850ba9e

MALICIOUS

PDF

45.3 KB Created: 2020-09-01 07:39:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 2ccbfbcb5898af3e0651cb14ffcfcfc5 SHA-1: 718912aa53bb428e3f9edecef8a2ce345f78e388 SHA-256: 4194ae9db850ba9e226cf6c27a33612be60ee50c0c3ff74f10f50473f284f912

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a critical heuristic firing indicating a link to known malicious redirector infrastructure. Additionally, the ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same URL found in the heuristic firing, suggesting it is the primary lure. No scripts were extracted, but the presence of a malicious redirector URL points to a phishing or malware delivery attempt.

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=god+cape+imbued+guide
- https://static.usrfiles.com/ugd/b8c837_46ffed815959402a96d0ae1f5e3eee2a.pdf
- https://static.usrfiles.com/ugd/b8c837_0d7b570e39364345b586ef21a392c2a4.pdf
- https://static.usrfiles.com/ugd/1cc7e8_4246f5aa02a445cdbf0a34d89dc6edee.pdf
- https://static.usrfiles.com/ugd/df4650_327c81ad6cc64cd8becd1f8e36c88958.pdf
- https://static.usrfiles.com/ugd/8d57bd_da79261441b941b7867a27013a06cadb.pdf
- https://static.usrfiles.com/ugd/b4a829_c54eb18da41a462cb5e1d9dd4937c847.pdf
- https://static.usrfiles.com/ugd/8cbfce_88d2d0d5934845c4926819d2125feb62.pdf
- https://cdn.shopify.com/s/files/1/0431/2930/7296/files/17836383733.pdf
- https://cdn.shopify.com/s/files/1/0432/9740/7126/files/66136720553.pdf
- https://cdn.shopify.com/s/files/1/0434/3801/4616/files/zuvubonusowebezal.pdf
- https://cdn.shopify.com/s/files/1/0437/0386/1401/files/limiting_adjectives_worksheet_grade.pdf
- https://cdn.shopify.com/s/files/1/0437/5478/2869/files/asi_wind_acaan.pdf
- https://cdn.shopify.com/s/files/1/0428/7250/4483/files/kuxokem.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_off0000744d.bin` `3f162fa4d83a070f65f2c9a52fc20f36dea8b09a0d6248841c27bff153206247`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x744D	5256 bytes
`font_01_sfnt_off00008622.bin` `9118814963d8faa452ff2086b094bb890582b0d3d4993df04648f7ffefedba70`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8622	10136 bytes

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