Malicious PDF — malware analysis report

Static analysis result for SHA-256 9585a044e866f44f…

MALICIOUS

PDF

43.0 KB Created: 2020-08-04 15:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a8debdc64f514222e63428776768ec7 SHA-1: 05c7049203bf1efc383164ff79f1d406e0720fdc SHA-256: 9585a044e866f44fd73b151359f2e9c3374c08f9f1810c521874fe1447690bf8
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains a large number of embedded links, many pointing to Shopify domains, but one critical link redirects to a known malicious infrastructure at ttraff.ru. The document body, though heavily obfuscated, contains the text 'Ccht practice exam 2020 pdf' and the malicious URL, suggesting a lure to download a fake exam. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector link confirms a malicious intent to lead the user to a harmful destination.

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/pify?keyword=ccht+practice+exam+2020+pdf
    • http://files.ncyra.org/uploads/1/3/1/4/131453251/09720b6.pdf
    • http://files.maarshainc.com/uploads/1/3/2/6/132695828/7474819.pdf
    • http://files.dairycareaction.org/uploads/1/3/2/7/132710797/lenilesofefitovi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7881/1810/files/zitosezerikono.pdf
    • https://cdn.shopify.com/s/files/1/0432/8230/1094/files/ocean_of_free_books_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6338/6017/files/calottery_winning_numbers.pdf
    • https://cdn.shopify.com/s/files/1/0441/3063/1832/files/wifi_hotspot_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0428/1463/6198/files/89038680545.pdf
    • https://cdn.shopify.com/s/files/1/0435/5047/4403/files/25215754305.pdf
    • https://cdn.shopify.com/s/files/1/0433/1097/3083/files/xenetisunotuw.pdf
    • https://cdn.shopify.com/s/files/1/0427/8291/6767/files/nopumuvigapowopedumu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pobilimej.pdf
    • https://cdn.shopify.com/s/files/1/0429/9443/4202/files/68013482393.pdf
    • https://cdn.shopify.com/s/files/1/0428/7637/1110/files/vowodevavegafabofakipiteb.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_off000067c4.bin
fed58b9be0af20804c879850d9d6bbd1769ffa7ad5304cf15b3a735f4a100bb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67C4 5432 bytes
font_01_sfnt_off00007a19.bin
cbec2737f721845da7397eb50c6422cf4ab5a05f006d59312af9384657ee326d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A19 10944 bytes

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