PDF malware analysis — malicious · b2bfa7ec3716865a

MALICIOUS

PDF

50.1 KB Created: 2020-09-09 01:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: ea5bbee565846999dff75b4d49901899 SHA-1: e0c9b2689329de88e930506302c4f0f18c14d4c7 SHA-256: b2bfa7ec3716865a32ea1da111b6d8aa6a3610c8f266afa61d39867a4c71091a

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm designed for SEO poisoning, with the primary malicious link pointing to a redirector. The document body text explicitly mentions 'Counter strike 1.6 cheats free' and includes the malicious URL, indicating a social engineering lure. The ML classifier also strongly flagged this PDF as malicious.

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=counter+strike+1.+6+cheats+free
- https://static.usrfiles.com/ugd/d01287_c862ea35270c4ae99b141d7b870c734e.pdf
- https://static.usrfiles.com/ugd/4aae87_4c4491b2f2c042e48fca90cd71759027.pdf
- https://static.usrfiles.com/ugd/9f6a24_5720310c222e4ba3bdd5c40915e4da62.pdf
- https://static.usrfiles.com/ugd/ecd213_6e5006f19d02433a871bac0f4cb6d06f.pdf
- https://static.usrfiles.com/ugd/b972d5_ddf198b7a60747eda9d04a00dab73a20.pdf
- https://static.usrfiles.com/ugd/d90490_77623b9335474af8a08c962348454512.pdf
- https://static.usrfiles.com/ugd/b8c837_8d82f48c52684b2cb2f4299c37467ed4.pdf
- https://static.usrfiles.com/ugd/6cfc61_cb35b112b63f46e5befbe292bb521d34.pdf
- https://static.usrfiles.com/ugd/a382ee_033d374c43c14571972a2aa2f8bbed0e.pdf
- https://static.usrfiles.com/ugd/49488e_d4e9900d6b354dba89dfae44ed172643.pdf
- https://static.usrfiles.com/ugd/7dd30d_07e873133b874a2db3e05a16d4c4930f.pdf
- https://static.usrfiles.com/ugd/3cb679_24a6707fc62d485490c8433079efb6c6.pdf
- https://static.usrfiles.com/ugd/15ebe2_7932c0271c8b4e5a8bf7687d28b1a371.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_off00007daa.bin` `29e7bc77789070cbacf99752bdcc100ae53a9d82c294085a0769fbe64d23d59a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7DAA	5144 bytes
`font_01_sfnt_off00008f35.bin` `9177f031988fdbe8a2251d92b51957ef90067357da9672018ff62ca41ad87e12`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8F35	14168 bytes

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