Malicious PDF — malware analysis report

Static analysis result for SHA-256 121a91121f03096c…

MALICIOUS

PDF

62.0 KB Created: 2020-09-01 04:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c2e7aaa8dbfd7cad4b02b6b6e209380 SHA-1: 94db078dce79c1681ac0c040306d06f501086cc6 SHA-256: 121a91121f03096c57afbf54a9f10996d896da079e9e12bb41470848bafb4bc0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to direct users to a malicious site. The presence of numerous other PDF links, many hosted on Shopify, further indicates a link farm or SEO manipulation tactic to obscure the malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=param+vir+chakra+winners+information+in+english
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5335/0040/files/physics_formulas_for_class_12_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/6462/2246/files/tx_lotto_report.pdf
    • https://cdn.shopify.com/s/files/1/0435/1895/1576/files/guxixetagunubixisavowopi.pdf
    • https://static.usrfiles.com/ugd/b8c837_dfe1d7760b8645cd8075260c6caec18d.pdf
    • https://cdn.shopify.com/s/files/1/0429/6943/2230/files/livro_de_matematica_analise_combinatoria.pdf
    • https://cdn.shopify.com/s/files/1/0437/7201/8845/files/pezufeduxipokaferu.pdf
    • https://cdn.shopify.com/s/files/1/0436/5497/1557/files/8410896559.pdf
    • https://static.usrfiles.com/ugd/bdeb4c_ae9eb54249844e5caf715cd10880f916.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_aded177bfe19454982e5fe430265e4d0.pdf
    • https://static.usrfiles.com/ugd/b8c837_33d8c61b388f47fc97ebbf1c00f5c01f.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a0a1.bin
e449facfc27152e3d86b8380e029f684747d65a7fa6509bcc46aef2b30cfee20
pdf-font-stream PDF embedded font (sfnt) at offset 0xA0A1 5512 bytes
font_01_sfnt_off0000b356.bin
44820106713e8e597fef1280bfa3464669e74a37cbed432eb1fc7edd881da7de
pdf-font-stream PDF embedded font (sfnt) at offset 0xB356 10076 bytes
font_02_sfnt_off0000d60c.bin
ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD60C 16164 bytes