Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40c510f73063313…

MALICIOUS

PDF

39.2 KB Created: 2020-08-15 05:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6ee31e061794d0ef0ef205b5c83d5e5 SHA-1: 522ed80ff43d103c333671b53f0dc815c57408e1 SHA-256: b40c510f7306331301ea2bcb805cb4db0e08df582b442fb5f941a932d7f6370c
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.com' with a keyword related to PDF watermark removal. The document body also contains this URL and numerous other links to Shopify-hosted PDFs, suggesting a link farm for SEO poisoning or traffic redirection. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be luring users to a malicious site via a seemingly helpful 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.com/wb?keyword=remove%20watermark%20from%20pdf%20in%20acrobat
    • http://files.daryljarod.com/uploads/1/3/1/4/131453176/mimodeda.pdf
    • https://cdn.shopify.com/s/files/1/0432/2800/4507/files/lujezoluligewu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/17958453685.pdf
    • https://cdn.shopify.com/s/files/1/0437/3970/9589/files/nopafogoji.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gofifarigomikidapowokov.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8577/files/16860512251.pdf
    • https://cdn.shopify.com/s/files/1/0440/8786/9592/files/vifave.pdf
    • https://cdn.shopify.com/s/files/1/0440/5736/2597/files/dexudufawejudubiji.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2629/files/wiritonividoworirumuzus.pdf
    • https://cdn.shopify.com/s/files/1/0432/9822/6329/files/devi_kundalini_shakti.pdf
    • https://cdn.shopify.com/s/files/1/0431/9579/3557/files/nonasedadunobezab.pdf
    • https://cdn.shopify.com/s/files/1/0439/3756/2779/files/niwetapigosukeledefo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6713/7438/files/savixekum.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_off00005b56.bin
83236abc0d4c41a774bb5ffb71d89a41605929e2f48f1d3346a8b53c8ce20a68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B56 5452 bytes
font_01_sfnt_off00006de2.bin
927fe986768c190ed4922310a21265c9a174fd6250eb4b2ab2cc88843b6943a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE2 10000 bytes

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