Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b964268607e008…

MALICIOUS

PDF

34.6 KB Created: 2020-08-31 03:39:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0d5716c96190366c35a137f2621a2fc SHA-1: 37d4860f39290063af2ae436297e431cd9cd68e1 SHA-256: 22b964268607e0088b5f312948dc90399b6dc6aa668ec71c5a412dc7a1bc6a85
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/wix?keyword=cs+go+4%253A3'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on Shopify. The document body, though heavily obfuscated, contains the same redirector URL and a reference to 'Cs go 4:3', suggesting a lure. The ML classifier also strongly flagged this PDF as malicious.

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.club/wix?keyword=cs+go+4%253A3
    • https://static.usrfiles.com/ugd/dc8a8e_bbb0ea835b664b05b06014a4889abc0f.pdf
    • https://static.usrfiles.com/ugd/fd3290_15d3b1bc62214fb0bab852ae5aec95af.pdf
    • https://static.usrfiles.com/ugd/6f58fb_d8b1fc461ea84fcb99b03441447ec230.pdf
    • https://cdn.shopify.com/s/files/1/0437/9181/0717/files/duolingo_android_delete_language.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pegumi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5137/7049/files/fijavuvawifu.pdf
    • https://cdn.shopify.com/s/files/1/0445/6418/5247/files/cours_de_chinois_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0428/3580/4319/files/smoke_logo_reveal_after_effects_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/5507/0880/files/robozivadavikosalamuxej.pdf
    • https://cdn.shopify.com/s/files/1/0451/8169/8199/files/komal_ganatra_marksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/9191/0038/files/91851476181.pdf
    • https://cdn.shopify.com/s/files/1/0429/4616/6943/files/10243875461.pdf
    • https://cdn.shopify.com/s/files/1/0440/3747/2421/files/texejovij.pdf
    • https://cdn.shopify.com/s/files/1/0435/9582/5314/files/28722495384.pdf
    • https://cdn.shopify.com/s/files/1/0434/8562/6520/files/7331455826.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_off00004d29.bin
db74f1d6e51e0fe844bb5964781cb4266d734e2187ce3de49990f01501019a5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D29 4724 bytes
font_01_sfnt_off00005d61.bin
e4d4edabe686f1d208ac5cb4fa92980b14244cb9d0ab5ee9a859da0ec0191386		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D61 9532 bytes

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