Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7a73a6dbe4ded1…

MALICIOUS

PDF

39.7 KB Created: 2020-08-31 13:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb92a92c3bec8938c035110639b27f40 SHA-1: ad241651b6f568b95a62a61d12e28c670d333c7d SHA-256: bb7a73a6dbe4ded1442bfe4aa30d87eb42d29eadde0a4cdc4c5761c0ccf34e0d
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'ttraff.cc'. The document body, though partially corrupted, contains text related to legal codes and the malicious URL, suggesting a lure. The presence of a large number of external PDF links, many pointing to 'static.usrfiles.com', indicates a link farm strategy, likely to improve SEO for malicious content or to obscure the true destination. The ML classifier also strongly flagged this PDF as malicious.

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.cc/wix?keyword=novo+c%25C3%25B3digo+de+processo+civil+comentado+marinoni
    • https://static.usrfiles.com/ugd/33a2e4_abec32d60dd44080a89863760ad40f08.pdf
    • https://static.usrfiles.com/ugd/74a852_69ced4f20c564958b483660e2ac71479.pdf
    • https://static.usrfiles.com/ugd/b88e3d_d3ef3a405d3a4053b215048916e6a042.pdf
    • https://cdn.shopify.com/s/files/1/0431/1682/2692/files/31684942448.pdf
    • https://cdn.shopify.com/s/files/1/0432/1430/7496/files/20879523491.pdf
    • https://static.usrfiles.com/ugd/77eba6_9fab290294604cfb9f920287ce12f98a.pdf
    • https://static.usrfiles.com/ugd/6f58fb_b604063fc22a43cf838c865e50159191.pdf
    • https://static.usrfiles.com/ugd/b8c837_f78dec1a0373414491daf7d67e769be4.pdf
    • https://static.usrfiles.com/ugd/b8c837_c1c55af24b0a4521af701ff3025378bd.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f3dcc434ccf4713bb7ef50dd056a26e.pdf
    • https://static.usrfiles.com/ugd/9904c2_931d8abf58bf46d38eb445c62a8cfed8.pdf
    • https://static.usrfiles.com/ugd/b8c837_ff238bc9a5d74139b1572a6204f549ea.pdf
    • https://static.usrfiles.com/ugd/8ab72e_d8dff0542a5e4b8d84e64894a3bb790e.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_off000055e7.bin
3a2fee09c85468b196b74032af5d2793975f8c41891ceaa1177731c7ac447e98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55E7 5556 bytes
font_01_sfnt_off00006880.bin
a8b3a2bbd29697722b9cf5c6b932c75de08f6f0f0bea831e4f44e13f4970a271		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6880 12824 bytes

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