Malicious PDF — malware analysis report

Static analysis result for SHA-256 2decc09f1611df0e…

MALICIOUS

PDF

47.9 KB Created: 2020-08-13 22:40:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03a84f1e27a6d6f48a8b5741b022a395 SHA-1: be87b515ba690761d6215436551b8393be960c99 SHA-256: 2decc09f1611df0ea08839de6eacfbaaa6e948c6227187e697200efed6c119e9
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=single+stage+cluster+sampling+pdf'. It also features a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of the malicious URL is the primary indicator of compromise.

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/pify?keyword=single+stage+cluster+sampling+pdf
    • http://files.noestansolos.org/uploads/1/3/0/7/130776266/gogegolivulinob.pdf
    • http://files.maximsdogue.com/uploads/1/3/1/4/131483083/voxulorawifegixus.pdf
    • http://tevaxezaw.davidawestbrook.com/uploads/1/3/1/4/131482995/vajudubom.pdf
    • https://cdn.shopify.com/s/files/1/0434/9159/0308/files/72893533061.pdf
    • https://cdn.shopify.com/s/files/1/0428/3629/5836/files/zetox.pdf
    • https://cdn.shopify.com/s/files/1/0440/5837/8392/files/78590409050.pdf
    • https://cdn.shopify.com/s/files/1/0431/7220/0605/files/58253157624.pdf
    • https://cdn.shopify.com/s/files/1/0433/7064/3614/files/mp4_to_jpg.pdf
    • https://cdn.shopify.com/s/files/1/0431/1895/2612/files/sudetodegoluwafu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1080/8216/files/751855186.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/wemuxepi.pdf
    • https://cdn.shopify.com/s/files/1/0437/5789/5831/files/56730527795.pdf
    • https://cdn.shopify.com/s/files/1/0434/1451/9973/files/sojixogovato.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_off00007d58.bin
5a95a3a3556b7130001d11509221f631177b171dc05ecc5bca04e0a46da8d064		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D58 5580 bytes
font_01_sfnt_off0000903d.bin
c24cad4906597cb60acd2046b07f05231b1fa91a2861bfaf14eb447ce9df5fd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x903D 10140 bytes

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