Malicious PDF — malware analysis report

Static analysis result for SHA-256 5881e663b695f239…

MALICIOUS

PDF

42.2 KB Created: 2020-08-23 22:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad9b2c797373b70920d5d52f06dbb7a8 SHA-1: 5928b251f5d382e20e580e1486438a0d620216b4 SHA-256: 5881e663b695f2399670504eb019be3cedd3287b5299bec8a33126ac08debd0f
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a link to a PDF about sedatives, hypnotics, and anxiolytics. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the PDF_SEO_LINK_FARM heuristic indicates a large number of external links, many hosted on Shopify, likely to obscure the malicious destination. The ML_NYX_PDF_MALICIOUS score further supports the malicious classification. The primary IOC is the redirector URL, which is designed to lead users to harmful content.

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/pify?keyword=sedatives+hypnotics+and+anxiolytics+pdf
    • http://files.seriousleisure.net/uploads/1/3/2/6/132695280/931eaeda1e7.pdf
    • http://files.mayfieldwomensclubofwc.org/uploads/1/3/1/0/131071043/6e4b0f42a668.pdf
    • http://rurogizam.travismurphygeo.com/uploads/1/3/1/4/131406893/3484454.pdf
    • https://cdn.shopify.com/s/files/1/0432/7846/7238/files/75690967976.pdf
    • https://cdn.shopify.com/s/files/1/0437/8787/8549/files/10937178593.pdf
    • https://cdn.shopify.com/s/files/1/0440/2230/0822/files/nogedijejiluf.pdf
    • https://cdn.shopify.com/s/files/1/0430/8644/6746/files/35172754063.pdf
    • https://cdn.shopify.com/s/files/1/0438/5813/3152/files/62936786196.pdf
    • https://cdn.shopify.com/s/files/1/0431/4392/1820/files/91255316292.pdf
    • https://cdn.shopify.com/s/files/1/0435/2727/4645/files/25284312645.pdf
    • https://cdn.shopify.com/s/files/1/0437/6104/1559/files/35472119860.pdf
    • https://cdn.shopify.com/s/files/1/0435/9038/5821/files/excel_download_for_mac.pdf
    • https://cdn.shopify.com/s/files/1/0430/7193/0529/files/wazotawujufevezuwovajuv.pdf
    • https://cdn.shopify.com/s/files/1/0440/4586/1029/files/addy_nagar_new_video.pdf
    • https://cdn.shopify.com/s/files/1/0437/7794/9848/files/small_engines_troubleshooting.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_off000067c5.bin
9330bafac79030a3c8fcdb8b6b28800c721774bacd141099ca37bfae8063468b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67C5 5480 bytes
font_01_sfnt_off00007a72.bin
557f8b6e521fad3acbc49bbca622c72a901b0e964bcfd01f672471478ce4d4a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A72 9712 bytes

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