PDF malware analysis — malicious · e694392795006f77

MALICIOUS

PDF

40.6 KB Created: 2020-09-01 04:39:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: dcadadd1a8a84699ef59981cf8c03a73 SHA-1: 86305f4c76073d7551bb60b1e2c682b8f1d5f0d0 SHA-256: e694392795006f77b02dba57b524d017c02be1826dd846b7e88006227a6e0561

152 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded links that point to a known malicious redirector, ttraff.club. The document body, though heavily obfuscated, appears to be a lure related to accounting problems. The presence of numerous external links, many pointing to static.usrfiles.com, suggests a link farm or SEO poisoning tactic to distribute the malicious URL. The ML classifier 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.club/wix?keyword=accounting+balance+sheet+practice+problems
- https://static.usrfiles.com/ugd/b8c837_b0869b92a508407a95528e431fe236b3.pdf
- https://static.usrfiles.com/ugd/bfbc46_96d951a9b2da467ab3dfe773ec2d9d84.pdf
- https://static.usrfiles.com/ugd/868401_7a77e2857f2d48a78a7ab1112b0cb81a.pdf
- https://static.usrfiles.com/ugd/89c6ad_bc8f90712c644d0e9150b03968a34aba.pdf
- https://static.usrfiles.com/ugd/99a8f2_0b44669d9e834f0c80668e616c47bb98.pdf
- https://static.usrfiles.com/ugd/b5472a_8959512a600a478d9fae302b5afe7c91.pdf
- https://static.usrfiles.com/ugd/fb83f1_71454f00a71d4e21b788aa45e4444e7f.pdf
- https://static.usrfiles.com/ugd/67e251_631ab78050a14815a86092b9403cf3ce.pdf
- https://static.usrfiles.com/ugd/5926b4_cc3dbcb4412941ba8108002419262602.pdf
- https://static.usrfiles.com/ugd/b8c837_187e6a07cd594147978832de4c0a387d.pdf
- https://static.usrfiles.com/ugd/b8c837_9606e8de32fc4678b6a6a434a3988853.pdf
- https://static.usrfiles.com/ugd/a2c2bc_8d77353f68374b0a86d32d2fea0cda13.pdf
- https://static.usrfiles.com/ugd/0cd019_5a95e1ed03de411d9f63b09eb79f1a44.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_off000060f6.bin` `df284adea4a73c6c531324b78eb7319b7e1d1450e854a14680f543fa266ea53e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x60F6	5476 bytes
`font_01_sfnt_off0000736c.bin` `32826c3ee1fae06dc4a728428b5e68c8eb724b6893eefbd1457c781e984b2761`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x736C	9920 bytes

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