Malicious PDF — malware analysis report

Static analysis result for SHA-256 af0b3a9617a28e82…

MALICIOUS

PDF

41.6 KB Created: 2020-08-29 03:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af9365dd91daa34bd209058828133d36 SHA-1: e69a623daf6c6414a7f1aa351bbb1101c4d4d55f SHA-256: af0b3a9617a28e829344eda61bec8b2e095cf7e7d89599c2de7ed84ade700603
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.ru/wix?keyword=pcb+designing+steps+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, including one hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though corrupted, contains fragments of the URL and topic, suggesting a lure related to 'pcb designing steps pdf'.

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=pcb+designing+steps+pdf
    • https://cdn.shopify.com/s/files/1/0438/1710/7616/files/99347844632.pdf
    • https://cdn.shopify.com/s/files/1/0433/7205/2643/files/city_of_citrus_heights_police_reports.pdf
    • https://cdn.shopify.com/s/files/1/0436/3347/5737/files/thanthi_today_news_paper_in_tamil_download.pdf
    • https://static.usrfiles.com/ugd/b8c837_4fac8b22f7e44a8093401ab03043d3a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_e7110c20f72341d9a60270351c8b1b8c.pdf
    • https://static.usrfiles.com/ugd/b8c837_97475afa840e4ea294ac917e8e89c985.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c0b1f739eb242aa9231e83263d6eb70.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b6e61671bf14258ab38b24dae5e0cb3.pdf
    • https://static.usrfiles.com/ugd/b8c837_a77677dbcb4b448a8aa4d3c41675b922.pdf
    • https://cdn.shopify.com/s/files/1/0429/5095/1066/files/mitofasidakuwebomizomoko.pdf
    • https://cdn.shopify.com/s/files/1/0437/0549/9803/files/domestic_animals_colouring_pages.pdf
    • https://cdn.shopify.com/s/files/1/0434/7723/7917/files/61309213882.pdf
    • https://cdn.shopify.com/s/files/1/0459/2258/2679/files/9877119452.pdf
    • https://cdn.shopify.com/s/files/1/0434/0065/9100/files/hunter_killer_rating_parents_guide.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_off0000663b.bin
51809971e8f21bbce0a08d78640d325bd90d37dc9118093f0239754e47457752		 pdf-font-stream PDF embedded font (sfnt) at offset 0x663B 5124 bytes
font_01_sfnt_off000077b8.bin
0075b1ecf0ebdad0a1be997367ee07fe73715cc70c0aa8619d1f411b40125d3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77B8 10016 bytes

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