Malicious PDF — malware analysis report

Static analysis result for SHA-256 84256ef0996469f9…

MALICIOUS

PDF

42.2 KB Created: 2020-09-22 07:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf541f0bfe99fbd744581027b224fb95 SHA-1: 777a6c1e661ce7dd687f86c549faa650c7cad9e5 SHA-256: 84256ef0996469f9ff523d85c473f43cd1cea31409600bc401f494e44442c4b3
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.club/wix?keyword=packet+tracer+3.2.4.6'. The document body, though heavily obfuscated, also contains this URL and references 'Packet tracer 3.2.4.6', suggesting a lure. The PDF also exhibits characteristics of a link farm, embedding numerous external PDF links, many of which are benign but serve to obscure the malicious intent. The primary malicious IOC is the redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=packet+tracer+3.2.4.6
    • http://files.3925robotics.com/uploads/1/3/1/6/131637529/pijepup-gerupol-jojoj.pdf
    • https://f1ad45f8-3ecc-4f65-a1c6-d0bbd9a6863a.filesusr.com/ugd/6e13d9_c55d23b7cc3146b98904702a108f317a.pdf?index=true
    • https://0d3ddc2d-af64-4f28-9910-db7314807cff.filesusr.com/ugd/e2f197_45c81b6c23d14b759a37696492da5ace.pdf?index=true
    • https://ab3717dd-1f9f-4d76-950a-b58c4cd7528d.filesusr.com/ugd/f1c748_6435165719f445558bef47fdb1ed9af0.pdf?index=true
    • https://0bdc4092-0a44-44e6-a881-c5fa230e4603.filesusr.com/ugd/55cc32_dd030090e1ef439796caaab11b1fccbc.pdf?index=true
    • https://774e6e6c-8743-46a0-bd14-33c532be6317.filesusr.com/ugd/1df9ea_efcb780d1ca04f2a991df27728b7c013.pdf?index=true
    • https://d6f8aefc-0683-4d90-8963-cd2d06a7b1e1.filesusr.com/ugd/a4c1fa_8cf624e21eb94150b9a0498263a08e88.pdf?index=true
    • https://b3589177-20c0-4595-b0a8-86d391053876.filesusr.com/ugd/e33828_017ffde20f9c4b668a0a5d8b86badf8f.pdf?index=true
    • https://060e53a4-8abf-45a7-9a48-0eb50cd84bff.filesusr.com/ugd/c79b1c_d5a7f155e5894a7c9ed19a8ae08771ca.pdf?index=true
    • https://5b06bda6-7b71-4d05-97eb-4a06927e6b0b.filesusr.com/ugd/fb83f1_9060e9a4689549bd9e1f3844c5805f81.pdf?index=true
    • https://138dcd67-06de-4fdb-b152-ef481d95e0d6.filesusr.com/ugd/f80014_5af6887a4a944994a195dabaf31524c7.pdf?index=true
    • 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_off0000689e.bin
b23613dccd0c7f7ca0479898f9ba854691dc56628ca71fcb7e2e65a5f1e6dfc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x689E 5216 bytes
font_01_sfnt_off00007a7c.bin
e258ef4bac7e62627bc0734fc50b29572cb18040ece2e153b36f535a939ea1f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A7C 10044 bytes

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