Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57768db1d23bf3f…

MALICIOUS

PDF

39.4 KB Created: 2020-08-23 11:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b734fced9f9eafc03661729898a549f0 SHA-1: 9006ac886e91f8629f28b10d06c222f68d196df0 SHA-256: a57768db1d23bf3f606cdb1c96e4341d98be4949570579630ca7c07743491a67
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a Tamil newspaper. The document also features a large number of embedded links to external PDFs, many hosted on Shopify, likely as part of an SEO link farm to improve search engine ranking for malicious content. The ML classifier strongly indicates malicious intent.

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/pify?keyword=tamil+news+paper+online+free
    • http://batobumi.workshoots.com/uploads/1/3/1/4/131438003/venunedalupomuneg.pdf
    • http://files.digitaldesignsbymargee.com/uploads/1/3/1/3/131398131/5dcb368d29b.pdf
    • http://migezu.pwcyoga.com/uploads/1/3/0/8/130813834/0584f65.pdf
    • http://files.sozoeyboutique.net/uploads/1/3/0/7/130775221/8233665.pdf
    • http://files.arcrestour.com/uploads/1/3/0/7/130775831/f0c9521e4.pdf
    • https://cdn.shopify.com/s/files/1/0431/3415/6967/files/72278691347.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/19189676900.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3353/files/30300844102.pdf
    • https://cdn.shopify.com/s/files/1/0430/8110/5562/files/wujifulafukexaxaka.pdf
    • https://cdn.shopify.com/s/files/1/0437/0071/5674/files/primary_mathematics_3a_workbook_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/0026/5878/files/koxanazijadulej.pdf
    • https://cdn.shopify.com/s/files/1/0432/9163/9966/files/tumblr_app_search_settings_android.pdf
    • https://cdn.shopify.com/s/files/1/0428/6454/1852/files/45606948667.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_off00005d03.bin
1d103f7277cbbe7d1b0e24705d86624db50365e06b8186a7b31e508925482ea9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D03 5088 bytes
font_01_sfnt_off00006e46.bin
73fdcc6bed58f9e08e2dbd04b922542721d163ae3c69c9338d5172bb07209c11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E46 10088 bytes

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