Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31c83f61ae91d36…

MALICIOUS

PDF

39.6 KB Created: 2020-08-11 14:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 022dd522f9c3260e16f4bb1be264605a SHA-1: 1ff3f1ac11b56a860f47abf1a169de1afab44991 SHA-256: d31c83f61ae91d36142861c94fa8df7f3caecc107dffae28ad5b879f32f58dfc
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with the primary malicious redirector URL being https://ttraff.ru/wb?keyword=chinese%20self%20massage%20therapy%20pdf. The ML classifier strongly flagged this PDF as malicious. The document body itself is heavily obfuscated and contains embedded URLs, suggesting a lure to external 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.ru/wb?keyword=chinese%20self%20massage%20therapy%20pdf
    • http://files.ulrichpakker.com/uploads/1/3/0/7/130740591/3a3dd9f1c15f.pdf
    • http://files.paigeandbrittboutique.com/uploads/1/3/0/7/130776167/rotogifelerafedijalo.pdf
    • http://punalor.onegoodlife.net/uploads/1/3/1/0/131070374/tibixokopisitaj-xigepese.pdf
    • http://files.reselliconz.com/uploads/1/3/1/3/131379324/2553570.pdf
    • http://pivumozov.ipads4teaching.net/uploads/1/3/1/3/131380183/raxixa-kakuxiwubuwanak-lozekegutidi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0028/2783/files/nujekuwuni.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23281911610.pdf
    • https://cdn.shopify.com/s/files/1/0429/7054/6335/files/wexuga.pdf
    • https://cdn.shopify.com/s/files/1/0432/0378/8964/files/sexumenadepomoxubekelonex.pdf
    • https://cdn.shopify.com/s/files/1/0430/6727/7469/files/25793847663.pdf
    • https://cdn.shopify.com/s/files/1/0437/1313/4757/files/ciccarelli_psychology_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6435/files/gipaduviz.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/92942247807.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jokopewizemaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0234/files/xatisigefekeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/2033782386.pdf
    • https://cdn.shopify.com/s/files/1/0435/8039/1585/files/ukulele_capo_chart.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_off00005c0e.bin
f3692a293417485e59c8f29d3e6983b7dda27c49005adf0670656254193a59ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C0E 5464 bytes
font_01_sfnt_off00006e6e.bin
8058a0001b2d6d40724a38873df2ca72f39ce93c12732cd12573df209b0e34b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E6E 10216 bytes

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