Malicious PDF — malware analysis report

Static analysis result for SHA-256 2115cfd8a785103f…

MALICIOUS

PDF

39.8 KB Created: 2020-09-01 21:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a21e944c2673a55acb9404d32869bdbc SHA-1: 360f1f1f8dba2bdd9720a8d6ae5f2c7654414c21 SHA-256: 2115cfd8a785103fe845518dc93ace06a709b09753c422705bc6414018553770
150 Risk Score

Malware Insights

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

The PDF file contains a link farm and a direct link to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'Catamaran rx prior auth form'. The presence of numerous links to external PDFs, including one to a malicious redirector, indicates an attempt to direct the user to harmful content. 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=catamaran+rx+prior+auth+form
    • https://static.usrfiles.com/ugd/f3cb45_21611e6888de41618b87982d65b25b62.pdf
    • https://static.usrfiles.com/ugd/0047a4_e6c5174b073f4e6d8f181c52ad27c503.pdf
    • https://static.usrfiles.com/ugd/850f07_27b8ed62de4f42e3869a0805848d770d.pdf
    • https://static.usrfiles.com/ugd/225520_cb40056c34b94e7889586a86a0dede37.pdf
    • https://static.usrfiles.com/ugd/d1c05f_41ab185ac37040cdb8714b3364e774b6.pdf
    • https://static.usrfiles.com/ugd/e7e4a0_5f1c3b783478472889ec45abb8fd2e76.pdf
    • https://static.usrfiles.com/ugd/7ea8bb_234c7b9bd083406081a8c80323d7f95e.pdf
    • https://static.usrfiles.com/ugd/affaa6_657e6cefa26645f2822ee42657072722.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_32b2ed7859b04202a463f0f42a8389bd.pdf
    • https://cdn.shopify.com/s/files/1/0440/9327/6312/files/epf_withdrawal_form_19_non_aadhar.pdf
    • https://cdn.shopify.com/s/files/1/0430/1278/4277/files/niwik.pdf
    • https://cdn.shopify.com/s/files/1/0438/7730/2427/files/biometric_security_system.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_off00005efd.bin
f1586a3b68ef2f20536fd6c44f82061a32d208753e6882b56e11f501a792c9d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFD 4904 bytes
font_01_sfnt_off00006f83.bin
a9af0d5fd4a61d21aafd9ee0244b614554b4864ad8e7f8b1bc6385707b681977		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F83 10296 bytes

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