Malicious PDF — malware analysis report

Static analysis result for SHA-256 231b091947eca1c4…

MALICIOUS

PDF

39.0 KB Created: 2020-09-09 02:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00cb0ac44343bb15ef0530da45aad226 SHA-1: 6ad9e3a5a9f5fcdd9a559c6092e7277220a41b0d SHA-256: 231b091947eca1c4671fcee3964cac073e0c208f707af8efcdbd684a6ec75225
150 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as a unit conversion worksheet, but it redirects to a malicious URL. The ML classifier strongly indicates maliciousness. The primary malicious IOC is the redirector URL, which is likely used to serve further malicious content or phishing pages.

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.me/wix?keyword=converting+units+worksheet+doc
    • https://static.usrfiles.com/ugd/d48fe3_523ce9c4f72b49b8a0a2e1fcff01d5e6.pdf
    • https://static.usrfiles.com/ugd/4e6dd5_457ec14ef3644536b8f09ca793cbf550.pdf
    • https://static.usrfiles.com/ugd/01e791_0e0b68e66fb34c9a8e7cd5b62f8dc7f9.pdf
    • https://cdn.shopify.com/s/files/1/0434/9083/6632/files/bexazobigidadusupoj.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/65661346441.pdf
    • https://cdn.shopify.com/s/files/1/0428/9055/9655/files/bharat_song_musicbadshah.pdf
    • https://cdn.shopify.com/s/files/1/0429/6038/8252/files/linefipefobotebakajaku.pdf
    • https://cdn.shopify.com/s/files/1/0436/7430/4662/files/71623483903.pdf
    • https://cdn.shopify.com/s/files/1/0428/9606/4671/files/tifogisozufesaxob.pdf
    • https://cdn.shopify.com/s/files/1/0437/0530/3205/files/53225381832.pdf
    • https://cdn.shopify.com/s/files/1/0432/8433/2710/files/masaje_reductivo_antes_despues.pdf
    • https://cdn.shopify.com/s/files/1/0428/2158/3004/files/vitaxolovo.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_off00005a37.bin
2ed435a7ad72f13d411697f45fd79552448e9194e0d4e4c32fa70667fb62099c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A37 5080 bytes
font_01_sfnt_off00006b97.bin
bbc101b0cf05222e0df08ff2274fb5d80c454f49e510408a0335acb7068f453f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B97 10588 bytes

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