Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa2639094ccbc37…

MALICIOUS

PDF

39.6 KB Created: 2020-08-11 15:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abaed2fa70f33702f05375988b0ae0d8 SHA-1: 42b2e16e022ca9ace56e669b3ec6cbb3cfa55b24 SHA-256: 7aa2639094ccbc372b63dc0f7e72edee8685f1ff76a936d46a81da57312faf16
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'distance time graph worksheets' and a URL that appears to be part of a link farm designed to manipulate search engine results. The presence of a malicious redirector link suggests an attempt to lead the user to a malicious site, likely for phishing or malware delivery.

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/wb?keyword=distance%20time%20graph%20worksheets
    • http://files.centerschoolpto.com/uploads/1/3/1/8/131858287/1658886.pdf
    • http://gikem.zoetrodd.com/uploads/1/3/1/8/131871505/puridoji_repesumiza.pdf
    • http://files.themovementlifestyle.co/uploads/1/3/0/7/130775292/wulufex.pdf
    • https://cdn.shopify.com/s/files/1/0437/9177/7949/files/fijobexijodavatirokuzo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8180/1629/files/ti_82_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/93002866992.pdf
    • https://cdn.shopify.com/s/files/1/0429/4970/5881/files/lugaruritef.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5807/files/40651302221.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/lebibilofakejik.pdf
    • https://cdn.shopify.com/s/files/1/0436/9963/4326/files/34088976273.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mefopevepal.pdf
    • https://cdn.shopify.com/s/files/1/0434/5197/3799/files/7_point_container_inspection.pdf
    • https://cdn.shopify.com/s/files/1/0440/3471/9909/files/kubipagubuxugabezoxow.pdf
    • https://cdn.shopify.com/s/files/1/0430/7084/9181/files/lilomite.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_off00005d18.bin
d383b6eedced3a4618abc34c986a552100365f85a23e95b81c9967b1794b5683		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D18 5472 bytes
font_01_sfnt_off00006f91.bin
0af6f42292cb93bc1ec415a4e14eae4a4beafb3ee8b8381afc21ddcc51b1cd76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F91 10012 bytes

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