Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2e7cfa833038e5…

MALICIOUS

PDF

31.3 KB Created: 2020-11-01 10:15:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 854ae4ff24d144659dc8f2c2d48c5bd6 SHA-1: 53d1816533a1130d3d456a96ecd7be77d801c301 SHA-256: 7c2e7cfa833038e54006786975bd116154818064e74b9180b4d16371084351fd
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to the malicious URL and other PDF links, suggesting an attempt to drive traffic to potentially harmful sites. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ggtraff.ru/123?keyword=espa+pdf+gratis
    • https://cdn-cms.f-static.net/uploads/4368471/normal_5f89db0cf2d1c.pdf
    • https://cdn-cms.f-static.net/uploads/4374956/normal_5f8dbdaf49945.pdf
    • https://cdn-cms.f-static.net/uploads/4381971/normal_5f8d5b6ed0c3f.pdf
    • https://fasefipuronupa.weebly.com/uploads/1/3/4/4/134471496/2933254.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0504/8886/9055/files/68431213124.pdf
    • https://cdn.shopify.com/s/files/1/0496/2634/9719/files/nedojamemabazodeke.pdf
    • https://cdn.shopify.com/s/files/1/0503/7119/9163/files/12898394057.pdf
    • https://cdn.shopify.com/s/files/1/0499/9928/2336/files/91414481952.pdf
    • https://cdn.shopify.com/s/files/1/0483/7261/3280/files/tuziburazitosuxiluri.pdf
    • https://s3.amazonaws.com/fumiposamisur/gears_tv_channels_not_working.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005925.bin
8f3302bc01e73982d54a15d29f87cd20ab2c31fa9a297a7ccb633b81a437bdc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5925 5132 bytes

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