Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b6e71ddef97b63…

MALICIOUS

PDF

42.0 KB Created: 2020-08-29 13:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d942276b5977678fccd36cd6de5bb34 SHA-1: 7ff7899aec55463fa460e582b31d5e15602654ec SHA-256: 83b6e71ddef97b63dd943e146fd49cdb61ea87584ad7de6b41b215c39c87acf0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL, https://ttraff.cc/wix?keyword=cavapoo+rescue+near+me, is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other links, suggesting a phishing or redirection attempt. The ML classifier also strongly indicated maliciousness.

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.cc/wix?keyword=cavapoo+rescue+near+me
    • https://static.usrfiles.com/ugd/b8c837_fac12a86590b4132b6abe6c0d0b3c924.pdf
    • https://static.usrfiles.com/ugd/b8c837_b6fa439f4e394b0aa4670b60ef0a13cb.pdf
    • https://static.usrfiles.com/ugd/0dd040_f3f5d4071ab0414185804a859e68754b.pdf
    • https://static.usrfiles.com/ugd/0a0016_35119ae1363b4758b34b817f58412582.pdf
    • https://static.usrfiles.com/ugd/b8c837_d7202ca3fb5d4b8d985085529222a7bb.pdf
    • https://static.usrfiles.com/ugd/067ecb_eec46cc0938f49aba33d7398fb43a06f.pdf
    • https://static.usrfiles.com/ugd/b8c837_ddbbd5f0e68a4e4d8a973a8d228d58dd.pdf
    • https://static.usrfiles.com/ugd/b8c837_8af242500e944e1386a1ccb6cee31993.pdf
    • https://static.usrfiles.com/ugd/77941b_d7b7e5cd03d14c93a5a3df21cae6237d.pdf
    • https://static.usrfiles.com/ugd/b8c837_658b6e5f5b834fbfb7600d6405fdf8be.pdf
    • https://static.usrfiles.com/ugd/b8c837_0f1665510cc943a4abd4f90de84a8551.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.

FilenameKindSourceSize
font_00_sfnt_off00006730.bin
18374a3617e021c158ac006ce9ff2cb95c77455643d9350bf498b075fb58bca0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6730 5012 bytes
font_01_sfnt_off00007828.bin
78d327c3dcda0810b1ba249df62fc762274787481d115ee440bd16a3388bd849		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7828 10424 bytes

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