Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdda3b8f1c5c0281…

MALICIOUS

PDF

104.9 KB Created: 2020-09-10 23:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04fc6fdb4376b1379509a505d562b7e4 SHA-1: 6536364036c2fd87a2ab1fe1e317f0a988d81ec5 SHA-256: cdda3b8f1c5c02813feb028acd3cd0ff1a0fa73bd5582a563b6653e849f2dc99
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that aligns with the observed malicious link patterns. The primary attack pattern involves luring users through these links, likely to a phishing or malware distribution site.

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=brunelleschi+formazione+artistica
    • http://files.agentfortruth.com/uploads/1/3/1/3/131398455/5339a.pdf
    • http://xojire.michaeljperkinsschool.org/uploads/1/3/1/4/131437626/035437631ecce9.pdf
    • http://files.seamnc.org/uploads/1/3/1/3/131384185/ee4c01ee869.pdf
    • http://rilaw.deeperlifehuntsville.org/uploads/1/3/2/3/132302944/bexupewidisisal.pdf
    • https://static.usrfiles.com/ugd/b8c837_f76e49bd4db54925b40a48ba9ca7779d.pdf
    • https://static.usrfiles.com/ugd/c162b3_073d3b94f3bf4c4c9b28f208f11598dc.pdf
    • https://static.usrfiles.com/ugd/086daf_0ad104c4347049c28722a0dc1672baa1.pdf
    • https://static.usrfiles.com/ugd/33c377_c78d5311c8e04416bc348d2ae3aba5ef.pdf
    • https://static.usrfiles.com/ugd/529385_4529bfc219dc47968372120486874538.pdf
    • https://static.usrfiles.com/ugd/4f92c1_cb64d555d91649df9017589c89a93cb2.pdf
    • https://static.usrfiles.com/ugd/80c1db_80f54b442e02418da8dacbf4c307d981.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_off000160d9.bin
7443850604e60eafd78ba91cd4d59decc2fed40b547ac8caab753e64c2be5c7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x160D9 5220 bytes
font_01_sfnt_off00017278.bin
db2263390bb297763e55cec2fdd934ad8eb05e90d0166cc94324bd38f24c10cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17278 11132 bytes

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