Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d2865dbe7e7441…

MALICIOUS

PDF

41.7 KB Created: 2020-09-02 12:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aee2e69fb45761500d32982b072f3990 SHA-1: c001198909a32b6a3a350333d2fb03ca5187a367 SHA-256: d1d2865dbe7e7441afed781ee1a897899c4ea75fdc6f6dd6db936d93ca793278
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one heuristic specifically identifying it as a PDF link farm. The primary malicious URL, 'https://ttraff.ru/pify?keyword=blast+command+line', is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting its use in a phishing or malware delivery scheme. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=blast+command+line
    • https://cdn.shopify.com/s/files/1/0428/4098/1660/files/vejirugitixikumebug.pdf
    • https://cdn.shopify.com/s/files/1/0431/6866/1660/files/85512951605.pdf
    • https://cdn.shopify.com/s/files/1/0453/6195/4971/files/29613441058.pdf
    • https://cdn.shopify.com/s/files/1/0430/7877/9029/files/nujex.pdf
    • https://static.usrfiles.com/ugd/3bcfef_9f1ae8f6debb41a9acb4a3022764c474.pdf
    • https://static.usrfiles.com/ugd/16a96a_e794f0c78bc345f5be3d9e65867298d9.pdf
    • https://static.usrfiles.com/ugd/5af86b_64b9ee433b4646a9a2071efd29aaf49f.pdf
    • https://static.usrfiles.com/ugd/3f8d85_6acd0a37f40d49b6971ad245197b1ef5.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/eclipse_oxygen_java_9.pdf
    • https://cdn.shopify.com/s/files/1/0432/3416/4893/files/29708698377.pdf
    • https://cdn.shopify.com/s/files/1/0435/7606/6207/files/23286527681.pdf
    • https://static.usrfiles.com/ugd/b9801a_45b228b98f8e415d9422ae0aecbcc955.pdf
    • https://static.usrfiles.com/ugd/b6edda_180a9c961a234979b7f8568eb9bc46fb.pdf
    • https://static.usrfiles.com/ugd/b88e3d_ce515b0ea70f4cfba05a52d25fd1a35e.pdf
    • https://static.usrfiles.com/ugd/f67134_f4ec3d9e0c024373a99b4f98182dca0f.pdf
    • https://static.usrfiles.com/ugd/de65f7_72bf28c4a2c9432ba8c537936e2239e1.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_off00005f56.bin
c92af230212f73999ba004c099a2e490ba6d1da1e204961ec3e0c60b4937e759		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F56 5040 bytes
font_01_sfnt_off00007066.bin
d638002f9591bbe11696db7f5c7717cd84404627f6b0c6d41d7f220b4cb4f65b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7066 13100 bytes

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