Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8cf7192764f8b0…

MALICIOUS

PDF

38.6 KB Created: 2020-08-21 21:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3dc0b950749e443dbee3e708aa1b1cec SHA-1: c84a2e953fc33fca2ec5bcd4907ba6ae94a807c1 SHA-256: 4e8cf7192764f8b0b6822a3d734dec9df984f72c0316db9e2d481c8ce765d3c0
120 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, masquerading as educational content. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates the primary URL is part of a known malicious redirector chain. The PDF_SEO_LINK_FARM heuristic suggests the document is part of a larger scheme to generate traffic through numerous external links, many hosted on Shopify. The document body contains the lure text "Dr frost maths answers" and the URL https://ttraff.com/pify?keyword=dr+frost+maths+answers, which is the initial redirector.

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/pify?keyword=dr+frost+maths+answers
    • http://files.thislittlepetshop.com/uploads/1/3/1/3/131383760/misekawode-fapeja-rixubemupomi.pdf
    • http://nofaruru.alphaeta-ucsf.org/uploads/1/3/2/3/132302780/5066951.pdf
    • http://files.hawkinsfarmmarket.com/uploads/1/3/0/7/130739443/1242848.pdf
    • http://files.mrsudbury.com/uploads/1/3/0/7/130775712/luzebupusumaniz.pdf
    • https://cdn.shopify.com/s/files/1/0428/2767/7852/files/71846411177.pdf
    • https://cdn.shopify.com/s/files/1/0432/9914/3838/files/toxevefapuvuropodilurosa.pdf
    • https://cdn.shopify.com/s/files/1/0429/6248/5407/files/8841675076.pdf
    • https://cdn.shopify.com/s/files/1/0450/8103/4917/files/origami_bat_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0431/3314/1146/files/71521867687.pdf
    • https://cdn.shopify.com/s/files/1/0433/6805/4940/files/radiestesia_cabalistica.pdf
    • https://cdn.shopify.com/s/files/1/0429/6392/7206/files/guzujapalatepepu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5636/4711/files/pudin.pdf
    • https://cdn.shopify.com/s/files/1/0428/4717/4822/files/pokibuzosojepix.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c77.bin
1f6c1151e50a53d2d750bfc671dc0aa5e34f91e2302f464ef3aa77dcf11e8d56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C77 4808 bytes
font_01_sfnt_off00005ca6.bin
62f3cfe1ee62b6262dcba6ebd843ba138dde6d19efe336ef2e10e2e77f1ed8b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA6 10208 bytes
font_02_sfnt_off00007f9b.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F9B 4324 bytes

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