Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5f8a5b64c5e5b6…

MALICIOUS

PDF

40.3 KB Created: 2020-08-29 17:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b7e62b19d736fbd707f38d34993c868 SHA-1: 6013f85313606aaa44d9f67b7773792faa6849eb SHA-256: bc5f8a5b64c5e5b6c0edd7e83c4c77ae916e7c42a33929cdd83cde2d2a09344c
150 Risk Score

Malware Insights

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

The PDF was flagged for containing a malicious redirector link and a large number of embedded links, suggesting a link farm for distributing malware or phishing. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the ttraff.ru URL, which is likely used to redirect to a malicious payload or phishing site. The document body contains garbled text but includes the target URL and other PDF links.

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.ru/wix?keyword=fecha+de+la+guerra+de+reforma
    • https://cdn.shopify.com/s/files/1/0438/4659/8816/files/54048821824.pdf
    • https://cdn.shopify.com/s/files/1/0430/7802/5370/files/jiboze.pdf
    • https://cdn.shopify.com/s/files/1/0435/7187/1912/files/29488975292.pdf
    • https://static.usrfiles.com/ugd/b65acf_7ba5cfb4a2754a0b9995ca957df7901f.pdf
    • https://static.usrfiles.com/ugd/b8c837_a09ddbb188c44881a8a6ffc2f87c92af.pdf
    • https://static.usrfiles.com/ugd/b8c837_84d00b0aba554ca59aefe89adaa1aa86.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a50513b71d841099b13879ecfc9f6ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_995609e85b67412fa3bfd2832e752623.pdf
    • https://cdn.shopify.com/s/files/1/0432/9861/9557/files/33575020967.pdf
    • https://cdn.shopify.com/s/files/1/0432/3291/9720/files/tabela_de_torneio_de_futebol_com_5_times.pdf
    • https://cdn.shopify.com/s/files/1/0437/8168/5406/files/97721233172.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dobemajafapurotexujebo.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_off00005f98.bin
7b3c66b5727eba7b77bc1680c272d059fcdeefda7d83a4c40622a73aac2c0059		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F98 5212 bytes
font_01_sfnt_off00007129.bin
c884b9f0e1bf02c2d47ab87bb4d5e39305fa3166cf34307ac203fb2cbfd8696f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7129 10424 bytes

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