Malicious PDF — malware analysis report

Static analysis result for SHA-256 54aa8d04d1113727…

MALICIOUS

PDF

53.8 KB Created: 2020-08-07 18:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02c669aaf43af5522a0cf2737b8138cf SHA-1: 56261bf7795caf06e4493286bc7ece18169c3ebe SHA-256: 54aa8d04d11137272b1f4da918aaafcf44dd8324796dea4f00a25d1a0b710050
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/pify?keyword=t%25E1%25BA%25A1i+sao+m%25E1%25BB%2599t+s%25E1%25BB%2591+file+pdf+kh%25C3%25B4ng+m%25E1%25BB%259F+%25C4%2591%25C6%25B0%25E1%25BB%25A3c`. Additionally, a PDF link farm heuristic indicates the presence of numerous external links, with `https://cdn.shopify.com/s/files/1/0433/9276/2006/files/pedafutowux.pdf` being the first identified. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily corrupted, contains the same malicious URL and benign Shopify URLs, suggesting a lure to external content.

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=t%25E1%25BA%25A1i+sao+m%25E1%25BB%2599t+s%25E1%25BB%2591+file+pdf+kh%25C3%25B4ng+m%25E1%25BB%259F+%25C4%2591%25C6%25B0%25E1%25BB%25A3c
    • http://files.repaythis.com/uploads/1/3/1/3/131379443/9226f73fb.pdf
    • http://files.hoclincolnorders.com/uploads/1/3/0/9/130968933/bimubemilukez.pdf
    • http://files.jordonministries.com/uploads/1/3/1/4/131410094/demukuxilisu_duzit_vefafamiwinelo_nakanodi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9276/2006/files/pedafutowux.pdf
    • https://cdn.shopify.com/s/files/1/0432/0785/2192/files/97913368236.pdf
    • https://cdn.shopify.com/s/files/1/0432/3311/6315/files/wagexuroguvobida.pdf
    • https://cdn.shopify.com/s/files/1/0438/5862/4672/files/13785921348.pdf
    • https://cdn.shopify.com/s/files/1/0439/8333/9678/files/mastering_elliott_wave_glenn_neely_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/9722/6402/files/horizontal_list_html.pdf
    • https://cdn.shopify.com/s/files/1/0431/9074/7295/files/19261395665.pdf
    • https://cdn.shopify.com/s/files/1/0431/6404/1373/files/gosavofakatorelijusolix.pdf
    • https://cdn.shopify.com/s/files/1/0434/7238/8246/files/90689897227.pdf
    • https://cdn.shopify.com/s/files/1/0429/9302/5183/files/42791733261.pdf
    • https://cdn.shopify.com/s/files/1/0433/4796/8149/files/kusubojexunujugurekin.pdf
    • https://cdn.shopify.com/s/files/1/0445/4455/7220/files/warhammer_40k_codices.pdf
    • https://cdn.shopify.com/s/files/1/0440/6149/1365/files/xamarin_studio_theme.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b97.bin
c712209e4206b5ba7d29b38fd5a54eaf491ce47eb75f07aa0c3e549350973a8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B97 6820 bytes
font_01_sfnt_off000080a4.bin
b4d6dfa0aa716a1e51c1a63b210de0793670a9cf9718f5340414d7945f5d5f97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80A4 22648 bytes
font_02_sfnt_off0000b142.bin
4954ddec54c61b6acc7eddbac306bc890d05f3afdfcf3ae890c7612da0a7d668		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB142 16376 bytes

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