PDF malware analysis — malicious · 229951ce0436b419

MALICIOUS

PDF

40.3 KB Created: 2020-08-31 01:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: deabf957f7b3fe4bd3bb93ba6c3868ea SHA-1: 3c0b3f5169932478594591035d7f310d239873cc SHA-256: 229951ce0436b419169704988d18d1f762e580f59e62664ae2294819f9eaf9b7

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a 'Consumer Reports car buying guide'. The ML classifier strongly indicates maliciousness. The primary IOC is the redirector URL, which is designed to lead users to further malicious content. The PDF also contains a large number of external links, many pointing to static.usrfiles.com, suggesting a link farm or SEO poisoning attempt to improve search engine ranking for malicious content.

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.com/wix?keyword=consumer+reports+car+buying+guide+20
- https://static.usrfiles.com/ugd/0049ca_32885b9e81f7459ba22a129ed74a4195.pdf
- https://static.usrfiles.com/ugd/cac9e4_f355bd220a704833889d66f380c4b225.pdf
- https://static.usrfiles.com/ugd/b8c837_fedbe688fa864d9dadf190efbd874268.pdf
- https://static.usrfiles.com/ugd/b8c837_b49899ea6ce24531be5abbcbe765ce65.pdf
- https://static.usrfiles.com/ugd/804ff6_af601b6ca8fa4e21a48c447a0683edbd.pdf
- https://cdn.shopify.com/s/files/1/0429/0802/4985/files/vubegatuziposufa.pdf
- https://cdn.shopify.com/s/files/1/0433/9502/3013/files/boxing_star_mod_apk_unlimited_money_revdl.pdf
- https://cdn.shopify.com/s/files/1/0434/2841/3607/files/cpcc_my_college.pdf
- https://static.usrfiles.com/ugd/735189_9a25bd13a19b4ee0bfbf049ccca72855.pdf
- https://static.usrfiles.com/ugd/ec0c41_ad5c44135d724656a7f05267090baf51.pdf
- https://static.usrfiles.com/ugd/80c1db_91215ab0398b495b99af0634396337ac.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_off00005e5d.bin` `512224f262e6fbd97f2b9c55d1b614751999abb4bc083241a40607317a806c0f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5E5D	5780 bytes
`font_01_sfnt_off000071eb.bin` `fba5c81e0ee9075d460af84b495a29cfb0f5606730a4b169588e9cc64dde490a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x71EB	10164 bytes

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