Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99cc04241a0065f…

MALICIOUS

PDF

44.6 KB Created: 2020-09-01 02:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ada2ae568180c0d8a3afd95bc05159d1 SHA-1: 54f6beb3dd2580fe100d8847c2413d7c1c7f98fc SHA-256: c99cc04241a0065f72d3e59587f345388a90f98c848f8433644ff0375f890912
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, that redirect to malicious infrastructure. The primary malicious redirector identified is https://ttraff.com/wix?keyword=russian+formalism+theory+slideshare. The document body is heavily obfuscated and appears to be a lure related to academic content, likely to entice users to click the malicious links.

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.com/wix?keyword=russian+formalism+theory+slideshare
    • https://static.usrfiles.com/ugd/4e6dd5_279ae229d79342bfa43304b1d34f5d78.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c9c9cb729df4c818de01045768e1714.pdf
    • https://static.usrfiles.com/ugd/9b7d8a_3e36d5a3cfc9431d8fb4485c57897fed.pdf
    • https://static.usrfiles.com/ugd/10b11f_861e2705d5744bcc83549d931329f862.pdf
    • https://cdn.shopify.com/s/files/1/0432/9930/7673/files/24966238929.pdf
    • https://static.usrfiles.com/ugd/e32576_f91904e21a3f419780d4e71ef639e0b8.pdf
    • https://static.usrfiles.com/ugd/60933b_885adb39a1a942a2bcf8d14e7ea3db94.pdf
    • https://static.usrfiles.com/ugd/2ca22b_99ce5cbb500b452ca16da0ee0529be95.pdf
    • https://static.usrfiles.com/ugd/e2b09b_dd4d9fb1877443738e75edfdb2291772.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_6219863549384972b7820b6460e56930.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_off00007028.bin
eadead6f010843568b5ccbf5353bf0c3112df590ae8da6f2320f5d320610d629		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7028 5256 bytes
font_01_sfnt_off000081ed.bin
a8fe661eb94f0d77bfed99f127d01a7b40d740ef8de3d5cf816d682f18ca8472		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81ED 10556 bytes

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