Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4659ae32a2842d5…

MALICIOUS

PDF

34.4 KB Created: 2020-08-03 00:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8d08230f0ace86074a378abb484f34a SHA-1: 58bc46787d285884b5aa49d1cd6b021fd2d201d7 SHA-256: c4659ae32a2842d5a33268201a3da701d3941dcac1b5438bb2eff385abb3e54b
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate this is a malicious redirector link and a link farm, suggesting the primary purpose is to lure users to malicious sites. The ML classifier strongly supports the malicious nature of the document.

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=hampton+bay+exterior+wall+lantern
    • http://files.byrdhouseandladybugs.com/uploads/1/3/1/8/131872238/5714882.pdf
    • http://files.balancedespitethechaos.com/uploads/1/3/0/8/130813906/filozidev.pdf
    • http://files.ps111adolphsochs.org/uploads/1/3/2/6/132695405/ebd3501642f4af.pdf
    • http://files.fosube.com/uploads/1/3/0/7/130740573/fudunaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fulefevizurosojasi.pdf
    • https://cdn.shopify.com/s/files/1/0436/9544/0040/files/25040832976.pdf
    • https://cdn.shopify.com/s/files/1/0436/9799/5944/files/mount_and_blade_warband_viking_conquest_companions.pdf
    • https://cdn.shopify.com/s/files/1/0432/3573/7764/files/tubunisezagupijola.pdf
    • https://cdn.shopify.com/s/files/1/0433/4062/8133/files/mad_city_gangster_life.pdf
    • https://cdn.shopify.com/s/files/1/0436/4160/2208/files/6729407371.pdf
    • https://cdn.shopify.com/s/files/1/0431/0827/0244/files/kavexigufi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4071/8496/files/dalenikakez.pdf
    • https://cdn.shopify.com/s/files/1/0438/1684/5469/files/tagunorolexitesu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8110/4541/files/sikemasewedelekesuvir.pdf
    • https://cdn.shopify.com/s/files/1/0429/3161/7945/files/28860335265.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/54440827626.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sezam.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_off00004952.bin
23347e581e5698c849ff003c2d4bc19fb4617ac57f019ff7f5e062c857d355f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4952 5148 bytes
font_01_sfnt_off00005ad1.bin
74b07fd823633f0e6b6bbd0b1096e2eb5ccd0a77a83e293cd3664db7418a39a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AD1 9904 bytes

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