PDF malware analysis — malicious · c50243515a307d16

MALICIOUS

PDF

44.5 KB Created: 2020-09-01 09:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: d8e0c8f4cf641f3ecbbbfcc07e7a6b6b SHA-1: 10bc07acbfc951451fb660b7d2c357d910264475 SHA-256: c50243515a307d16be517b03feeec60e148e4d5ea56990db144465656b758db6

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a prominent link to 'ttraff.ru' which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains the same URL and keywords related to software cracking, suggesting a lure to a malicious site. The PDF also hosts a large number of external links, many pointing to 'static.usrfiles.com', indicating a link farm SEO tactic 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.ru/wix?keyword=autocad+map+3d+2011+crack
- https://static.usrfiles.com/ugd/15cd4d_030a9b9c6890435581213ad918bd832d.pdf
- https://static.usrfiles.com/ugd/f80014_d8afe9ea35fa4a249f8cde956f3ab73a.pdf
- https://static.usrfiles.com/ugd/e2f7e1_d3de559744f4443f8da4228fe67d6c0b.pdf
- https://static.usrfiles.com/ugd/078c79_277560898ee54644935f14aa80bf932a.pdf
- https://static.usrfiles.com/ugd/b7306e_62f5ef76aeaa488a806544c311b934ab.pdf
- https://static.usrfiles.com/ugd/f459ea_f18cf0df963d485d8af74c762d6dcfdd.pdf
- https://static.usrfiles.com/ugd/48d9a1_55c1361c32ce463d8cf5ea0a5398d153.pdf
- https://static.usrfiles.com/ugd/e2c250_812e32561c8d4ac9846056deb69a5303.pdf
- https://static.usrfiles.com/ugd/756799_78aff8f37aa04b5d99c94bd954149c75.pdf
- https://static.usrfiles.com/ugd/a2d007_eef634f24314481fa8f8a086aca0c33c.pdf
- https://static.usrfiles.com/ugd/1decf9_7d9c2e13c970460f866e3b03e97bca30.pdf
- https://static.usrfiles.com/ugd/b8c837_073255147b3d4eb9af1680627590f601.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_off0000676b.bin` `faf70755b820877e0e77dc43f001426c4cd5fb5665a1dbad2817ec0af9a927b9`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x676B	5552 bytes
`font_01_sfnt_off00007a45.bin` `f713a3765a978335002522b81f76457c1530985017b8583690a6e857f981bbe6`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7A45	13968 bytes

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