Malicious PDF — malware analysis report

Static analysis result for SHA-256 df11a618f2a5915f…

MALICIOUS

PDF

41.4 KB Created: 2020-08-29 02:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7b13ff497d7dfad6d27f3c5a9b15b31 SHA-1: 48e5169ea8b18f4598b38ce2225fb7dea5f79d55 SHA-256: df11a618f2a5915fffa63ed499805d64b28eaef3cd492eba5576967eecf121ef
150 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 link farm designed to redirect users to malicious content. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically identifies a link to 'ttraff.me', a known malicious redirector. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, contains the same redirector URL and other benign-looking PDF filenames, suggesting a lure to external content.

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.me/wix?keyword=diferentes+que+encontram+o+nucleo+do
    • https://static.usrfiles.com/ugd/b8c837_42d41e60342244e4b845ba07bfca318e.pdf
    • https://static.usrfiles.com/ugd/b8c837_96ef957819994517b88d579f13cb03cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f9da9d239c04b9490fcdb421235720b.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec67cc3a1201451396d892e0c2da5cc6.pdf
    • https://cdn.shopify.com/s/files/1/0434/1052/2268/files/dononelimogonusutejer.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0888/files/badajeg.pdf
    • https://cdn.shopify.com/s/files/1/0433/4298/7423/files/normal_heart_rate_in_ecg_report.pdf
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/andrea_hirata_laskar_pelangi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6515/5487/files/aldol_condensation_reactions.pdf
    • https://cdn.shopify.com/s/files/1/0433/8348/8679/files/vebapupunataruzil.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_off00006097.bin
a2087ae9f33f930ca5a691f418e522ce5603ccd5e68c79a5b31b03896e75b53b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6097 5292 bytes
font_01_sfnt_off0000727a.bin
8df6ebcefafd6948ae7e00dbf06fd5fc5499d5c75a0cfcca0f64deb9123a5354		 pdf-font-stream PDF embedded font (sfnt) at offset 0x727A 11972 bytes

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