Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b97d6e0380a1146…

MALICIOUS

PDF

36.0 KB Created: 2020-08-06 05:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99695c80319c33fbd6bacea49691cb45 SHA-1: a54b1bdbdfe98eb7f61fb3deaf227cb961daaa07 SHA-256: 2b97d6e0380a11460e510843845f0b74b79824bdd277d62cfcbd66f6965ade30
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=walter+isaacson+leonardo+da+vinci+pdf+free+download', is designed to lure users by appearing to offer a free PDF download of a popular book. The PDF also contains a link farm heuristic, indicating it's part of a larger SEO manipulation effort to distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=walter+isaacson+leonardo+da+vinci+pdf+free+download
    • http://files.chtechlab.com/uploads/1/3/0/7/130775471/415e67d4.pdf
    • http://files.franklinvolleyballboosters.org/uploads/1/3/1/4/131411281/koxoxavi.pdf
    • http://files.chungmark.com/uploads/1/3/2/6/132695697/05ec14ffb8d6.pdf
    • https://cdn.shopify.com/s/files/1/0431/8245/7000/files/tunadelozeto.pdf
    • https://cdn.shopify.com/s/files/1/0434/8762/5369/files/kudodanawisigag.pdf
    • https://cdn.shopify.com/s/files/1/0428/8767/6063/files/zafolesalinatomejon.pdf
    • https://cdn.shopify.com/s/files/1/0437/0831/7850/files/kisuwafufukadino.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8480/files/95078096602.pdf
    • https://cdn.shopify.com/s/files/1/0433/2303/1720/files/83221764710.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fimovubonivunab.pdf
    • https://cdn.shopify.com/s/files/1/0434/5308/7911/files/wefafizokifid.pdf
    • https://cdn.shopify.com/s/files/1/0432/7302/7749/files/mevutanonebupokavokom.pdf
    • https://cdn.shopify.com/s/files/1/0434/0360/8214/files/93666819105.pdf
    • https://cdn.shopify.com/s/files/1/0431/3186/3202/files/53686808099.pdf
    • https://cdn.shopify.com/s/files/1/0431/1446/3394/files/mufoji.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_off00004f39.bin
d1bf0454f77c6552e3d523072535075bdf95600d380778f022fe744b2860f7fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F39 5316 bytes
font_01_sfnt_off0000617a.bin
7aacacdc1583d1774ee2cab81f019057366232c9b75e6236a3dfd8e44c4fffb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x617A 9756 bytes

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