Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e6df5cd3d90c38c…

MALICIOUS

PDF

44.9 KB Created: 2020-07-17 10:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a22127a6dc9e39d534c532250cf36001 SHA-1: 242f8846b5cf610df220257f7c3d044bc0051dfa SHA-256: 3e6df5cd3d90c38c813485fb90031c7508215efc6d78ecd48ef17cfde91224d6
150 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The document body, though heavily obfuscated, suggests a lure related to file conversion. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be directing users to external malicious sites via a link farm.

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.com/wb?keyword=convert%20jpg%20to%20pdf%20below%20200kb
    • http://files.thetlacademy.shop/uploads/1/3/1/3/131384789/dupive-madelubupazape-dezarekinoza.pdf
    • http://files.robyntillman.com/uploads/1/3/1/0/131070754/sepupapudi_foxubebarale_degiv_letapik.pdf
    • http://files.barbadiancanadians.com/uploads/1/3/1/6/131607063/balukufitub.pdf
    • http://files.gigharborcruisers.com/uploads/1/3/1/6/131607010/11da83.pdf
    • http://files.virvahinnemo.com/uploads/1/3/2/6/132682897/dabd6f3d12.pdf
    • http://files.drummondsmedlegal.com/uploads/1/3/1/0/131071209/9cf8efad25c11.pdf
    • http://files.antoniasellbach.com/uploads/1/3/1/8/131871467/7504635.pdf
    • http://files.gigharborcruisers.com/uploads/1/3/1/6/131607010/11da83
    • https://lejobadoni.files.wordpress.com/2020/06/takaborerizenaduxusapulad.pdf
    • https://tumezup.files.wordpress.com/2020/07/jufizol.pdf
    • https://fupiwexobus.files.wordpress.com/2020/07/55524376421.pdf
    • https://gopisasiru.files.wordpress.com/2020/07/85968894219.pdf
    • https://gopixur221482700.files.wordpress.com/2020/07/nibolizipat.pdf
    • https://cdn.shopify.com/s/files/1/0431/4329/9234/files/tobunavazewevasode.pdf
    • https://cdn.shopify.com/s/files/1/0433/3921/9099/files/rurunovexiladuvin.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31968244380.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/tufesaza.pdf
    • https://cdn.shopify.com/s/files/1/0430/6901/4177/files/44158936185.pdf
    • https://cdn.shopify.com/s/files/1/0427/8992/9116/files/63324743552.pdf
    • https://cdn.shopify.com/s/files/1/0430/8585/6919/files/1142719999.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lokilus.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_off00007064.bin
5cfe3b9a84fc173201ecb1bff47e5cf54636c26b821bc3bd119cb2e3c851b91a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7064 5292 bytes
font_01_sfnt_off0000829b.bin
bc78d9d7f3067032c495114290f1a1d0e8c1c8e3e74daa8a96c10b0b441c32ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x829B 10488 bytes