Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf63f922ed5d4c24…

MALICIOUS

PDF

81.3 KB Created: 2020-08-11 15:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3f33e655157fc9a8755289361f5bf90 SHA-1: 18955609005e7bdef782ab28a03e0599d21561a6 SHA-256: cf63f922ed5d4c2409e4b366877018e4b84bc1fc35245ba7802326c7609f62b9
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one specific link to a redirector at ttraff.cc. The document body, though heavily obfuscated, contains the string 'Cardiology sheet pdf' and the malicious redirector URL, suggesting a lure to trick users into clicking the link. The ML classifier also flagged this PDF with high confidence.

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=cardiology+sheet+pdf
    • http://files.evamarieyoga.com/uploads/1/3/1/3/131398231/d06e71d92aa07.pdf
    • http://files.bostonterriersnyc.com/uploads/1/3/1/4/131407148/2456590.pdf
    • http://files.myyogomania.com/uploads/1/3/0/8/130813869/c8115cd.pdf
    • https://cdn.shopify.com/s/files/1/0439/2986/2312/files/bibuveriwupokobavusebas.pdf
    • https://cdn.shopify.com/s/files/1/0428/8312/1319/files/jivewuludivipokogawek.pdf
    • https://cdn.shopify.com/s/files/1/0432/0513/2456/files/pazos.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/gonerufux.pdf
    • https://cdn.shopify.com/s/files/1/0430/0124/9955/files/39254410904.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/1960791164.pdf
    • https://cdn.shopify.com/s/files/1/0431/2432/6564/files/conceptos_basicos_del_materialismo_historico.pdf
    • https://cdn.shopify.com/s/files/1/0428/3367/4396/files/febumadisururiwijiti.pdf
    • https://cdn.shopify.com/s/files/1/0434/2477/6354/files/11033063279.pdf
    • https://cdn.shopify.com/s/files/1/0427/9504/0924/files/katupokol.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mosagewenusuwaguxizekud.pdf
    • https://cdn.shopify.com/s/files/1/0430/5197/4818/files/77282404670.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sejil.pdf
    • https://cdn.shopify.com/s/files/1/0431/7193/8453/files/jozuluxov.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_off0000fcdd.bin
e7b290c3afd883a14dffa79bb56cb4d36f8d67c478d711caee664c9632fc5c47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDD 5308 bytes
font_01_sfnt_off00010ef1.bin
b0d7506fa7308a3c1c6753800f14ff211bbe9cc77fd8c72fa53ff8a541f33822		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF1 12684 bytes

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