Malicious PDF — malware analysis report

Static analysis result for SHA-256 9510a4187bd6bb82…

MALICIOUS

PDF

33.1 KB Created: 2020-08-29 20:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbef44f3d24b7359112e6b7e3dd12f09 SHA-1: 6f3d1cd9ed20a90ef28b4ac0bb1594398f0c2f2b SHA-256: 9510a4187bd6bb8224f95dad2c37e0fd082ddb48de2c75b83cac9fab49125e50
150 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=microeconomics+colander+10th+edition'. Additionally, another critical heuristic indicates a PDF link farm, with numerous links to Shopify domains, though most are classified as benign. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine the exact lure.

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/wix?keyword=microeconomics+colander+10th+edition
    • https://cdn.shopify.com/s/files/1/0429/8476/7647/files/flute_sheet_music_hallelujah.pdf
    • https://cdn.shopify.com/s/files/1/0437/9348/1885/files/bibliography_format_apa.pdf
    • https://cdn.shopify.com/s/files/1/0429/7513/3859/files/87994447930.pdf
    • https://cdn.shopify.com/s/files/1/0456/4549/6487/files/15002577030.pdf
    • https://cdn.shopify.com/s/files/1/0451/1835/7669/files/esl_teacher_cover_letter.pdf
    • https://cdn.shopify.com/s/files/1/0435/0876/0742/files/3480805767.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/pobojujalopabun.pdf
    • https://cdn.shopify.com/s/files/1/0434/2435/0375/files/how_to_report_mental_abuse_at_work.pdf
    • https://cdn.shopify.com/s/files/1/0435/9671/0047/files/leave_form_template_doc.pdf
    • https://static.usrfiles.com/ugd/2c8d66_97399763cb63447c8626b93747417b22.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_6dbd13d2b6054889ab524063f99ee698.pdf
    • https://static.usrfiles.com/ugd/b8c837_35abd24c862d4319b7e29aed266c0f7d.pdf
    • https://cdn.shopify.com/s/files/1/0432/5149/9170/files/caddy_m24s.pdf
    • https://cdn.shopify.com/s/files/1/0431/3320/6690/files/algebra_and_trigonometry_james_stewart.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_off000044e1.bin
3f3478f2a152446aedf8ebb878f9202131c81be40efd1f8a7c6df5cb568071b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x44E1 5380 bytes
font_01_sfnt_off000056fb.bin
c141559b4bf5e948c019ec652eea8bc93b1176043475db77f35c0f355402a139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56FB 9520 bytes

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