Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdfef338d70128ba…

MALICIOUS

PDF

42.1 KB Created: 2020-08-30 09:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e740136642aa4458083bdc8e674907e SHA-1: 770d6f7b630e7cc05de913a769f8f47da5b71bfd SHA-256: bdfef338d70128ba9d0c87af1d8e435b18a225b350d6afb01e7a828b0803d9e6
150 Risk Score

Malware Insights

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

The PDF contains a link to `ttraff.ru` which is flagged as a malicious redirector, likely used to obscure the final destination. The document body mentions 'Ms office 2010 professional plus pro', suggesting a lure to trick users into clicking the malicious link. The PDF also contains a large number of embedded links, many pointing to `static.usrfiles.com`, which is identified as 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.ru/wix?keyword=ms+office+2010+professional+plus+pro
    • https://static.usrfiles.com/ugd/b8c837_a33d3cda790a4d43ba951291a5ab1ebf.pdf
    • https://static.usrfiles.com/ugd/10a4aa_f2f8fdf885104e4a92ddeb8157f36e19.pdf
    • https://static.usrfiles.com/ugd/b8c837_16d63047691748e19d09bcab43da2467.pdf
    • https://static.usrfiles.com/ugd/c3f88d_99fa24c94cbd4694822ed5c4070e9ec7.pdf
    • https://static.usrfiles.com/ugd/18f527_e4898d1ec0ab464a80f08e398fde8ec3.pdf
    • https://static.usrfiles.com/ugd/1849a1_2eb8590e411946059d0d773a54097e73.pdf
    • https://static.usrfiles.com/ugd/7ea8bb_48b1e02526674b79bd99f1b6d081ed59.pdf
    • https://static.usrfiles.com/ugd/4725f1_b34cec9c777447829e689097ac1027b5.pdf
    • https://cdn.shopify.com/s/files/1/0430/9604/7783/files/zuzupofijebu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6100/9829/files/85993973104.pdf
    • https://cdn.shopify.com/s/files/1/0431/6217/3604/files/25733788029.pdf
    • https://cdn.shopify.com/s/files/1/0430/4273/4237/files/19371308262.pdf
    • https://cdn.shopify.com/s/files/1/0427/5165/6102/files/37720369579.pdf
    • https://static.usrfiles.com/ugd/07625c_58e92b7e23674194926c76772e539239.pdf
    • https://static.usrfiles.com/ugd/9757e7_1aa75a27144a48a8814fedcde9abb6aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ab20aa27e6a4540a23c7558fa6d3eb8.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_off00006799.bin
cb72e561087bbad9e422b56eefa8cd8a35b386c35dc795553f0a0506af15c32a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6799 5340 bytes
font_01_sfnt_off000079db.bin
ff437ddc5e613fc9ede83c5a4567f579d2fef1b1f00781a064341e7f17929dc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79DB 10080 bytes

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