Malicious PDF — malware analysis report

Static analysis result for SHA-256 976a3da72a55caa9…

MALICIOUS

PDF

38.4 KB Created: 2020-08-19 01:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a806b9c05dff312f3bebda947190cfd SHA-1: 60709cd0a97d748d66313366fcb4ae53e57e7afd SHA-256: 976a3da72a55caa9d3cf01492a1b2039b2cd5cf9aa34930720c4bf988fab06c6
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Integers class 6 worksheet pdf' and the malicious URL. This suggests a social engineering attack aiming to trick users into downloading further malicious content via the 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.cc/pify?keyword=integers+class+6+worksheet+pdf
    • http://files.suffolkjuniorchess.org/uploads/1/3/0/8/130874566/e0e3238332.pdf
    • https://cdn.shopify.com/s/files/1/0428/8364/5599/files/48616052390.pdf
    • https://cdn.shopify.com/s/files/1/0439/9936/3222/files/wetigopajoxuguzolugigo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6657/files/65241974205.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89089693040.pdf
    • https://cdn.shopify.com/s/files/1/0434/7668/0870/files/14077611455.pdf
    • https://cdn.shopify.com/s/files/1/0436/3796/4960/files/jarekoragu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5405/6095/files/35077898894.pdf
    • https://cdn.shopify.com/s/files/1/0428/1715/9335/files/bomemiritixevuvuwuxido.pdf
    • https://cdn.shopify.com/s/files/1/0434/8536/4390/files/morof.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_off000056be.bin
cb1dcbb5c2915f0bdbd74272d9104b694b4ee41177faf4d040914e28a6babd1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56BE 5664 bytes
font_01_sfnt_off00006a0f.bin
5f64f4a61df4154a53bdf3bb3355feb131b69cb1e523d21a376816b4332b93cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A0F 10284 bytes

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