Malicious PDF — malware analysis report

Static analysis result for SHA-256 3044368f9d214568…

MALICIOUS

PDF

44.7 KB Created: 2020-09-12 11:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00d92ba58f8b7c6f388d6514890f7fb8 SHA-1: 7373e1ecdaba5c2b7c4add49c33e749869b34900 SHA-256: 3044368f9d214568e581a6c25a61c1781257024b1ba612c2e1b3ce11a08c3196
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm designed to lure users to malicious redirectors, masquerading as a 'numerical expressions worksheet pdf'. The primary malicious URL identified is https://ttraff.com/wix?keyword=numerical+expressions+worksheet+pdf. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous SEO-optimized PDF links indicates a campaign to distribute malicious content.

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=numerical+expressions+worksheet+pdf
    • http://files.mayusilkart.com/uploads/1/3/1/6/131607019/xupezakagojovi.pdf
    • http://files.bardimm.com/uploads/1/3/2/6/132695578/860db6d84ed.pdf
    • http://files.nlaofshreveport.com/uploads/1/3/1/3/131384279/nofelesojo.pdf
    • http://files.janellecox.com/uploads/1/3/2/7/132740285/fc44afb1e.pdf
    • http://gazol.conniecycling.com/uploads/1/3/1/4/131454950/direwokog_zemajipo_gewilazedi.pdf
    • http://mukona.bayareaflightinstruction.com/uploads/1/3/0/9/130969690/zakadogamov.pdf
    • http://files.mysonnyrae.com/uploads/1/3/0/9/130969984/revivi.pdf
    • http://jazefax.almostsponsored.com/uploads/1/3/1/6/131606407/20dc50.pdf
    • http://files.styleshades.com.au/uploads/1/3/1/3/131383486/c73d24.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_4d975554c201403bb6e907d2c5086138.pdf
    • https://static.usrfiles.com/ugd/0779a3_33962020381a40798011d05cc5ad9c86.pdf
    • https://static.usrfiles.com/ugd/3e0cb9_08c2989417424de0a245b9646115f078.pdf
    • https://static.usrfiles.com/ugd/1e557c_2954e71139e447e593ac96eff3a057d7.pdf
    • https://static.usrfiles.com/ugd/a4ea6c_5983cff1a156453aa5983f6e9dbf5e08.pdf
    • https://static.usrfiles.com/ugd/b8c837_271cbeca9dab4340b6fc9ed23a2e7d22.pdf
    • https://static.usrfiles.com/ugd/f2c1dc_4296425746344f199fae964ef3d51543.pdf
    • https://static.usrfiles.com/ugd/cb2bed_fdc300fe9acc406bb80117e71bb77517.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_off00006e1c.bin
4b3235b1f2a3ca6a919b38b7dae00fb197832d742f4d56aa6442741ecc511b8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E1C 5588 bytes
font_01_sfnt_off0000810c.bin
7a06a33c2204bbca5dcad2fb146e9b6bc99556a5eb1c9cff6511c998d1a22ac2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x810C 10548 bytes

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