Malicious PDF — malware analysis report

Static analysis result for SHA-256 e017df166622a31b…

MALICIOUS

PDF

43.6 KB Created: 2020-08-15 00:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a608e699e2ddaa33a71d1e47a26e7800 SHA-1: 8a20384e6ea8e96cb1b00cb8d9c46252cfbf9cc8 SHA-256: e017df166622a31ba6f72b3688ef031f70e14f9fac883c23fb8ad0f672ac4265
150 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The embedded URL https://ttraff.ru/pify?keyword=acet+application+forms is a primary indicator of this malicious redirection. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to application forms and the URLs suggest a pattern of linking to various PDF files, likely to obscure the malicious intent.

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=acet+application+forms
    • http://nujilore.deloreanguide.com/uploads/1/3/1/8/131856318/xivumazalifave.pdf
    • http://jegadapar.barrystaxidermy.net/uploads/1/3/0/9/130968984/vimadub-nezuroke-wumure.pdf
    • http://files.ceramics.se/uploads/1/3/1/3/131378852/9611f902.pdf
    • https://cdn.shopify.com/s/files/1/0439/1036/5339/files/pirates_of_caribbean_theme_piano.pdf
    • https://cdn.shopify.com/s/files/1/0430/1045/7753/files/raxuporixezuxogotifus.pdf
    • https://cdn.shopify.com/s/files/1/0427/9471/3244/files/11771649841.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/61547318866.pdf
    • https://cdn.shopify.com/s/files/1/0433/0645/1094/files/sarawak_government_almanac_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/0004/5465/files/brecon_beacons_os_map.pdf
    • https://cdn.shopify.com/s/files/1/0432/9065/6921/files/25051216221.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/27783734462.pdf
    • https://cdn.shopify.com/s/files/1/0445/6854/3396/files/monthly_current_affairs_in_english_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/9055/8620/files/61486171709.pdf
    • https://cdn.shopify.com/s/files/1/0434/1497/8718/files/livro_atkins_fisico_quimica.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_off0000620d.bin
eac540c5680c0b111679f5d38c9f470f0c069a66a3dcec26961ffaf32b3e6903		 pdf-font-stream PDF embedded font (sfnt) at offset 0x620D 5152 bytes
font_01_sfnt_off00007371.bin
37e50d6c0c3a88159701fe01dd30492ed0a10003ff226ebfd108e4e2011ec374		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7371 14772 bytes

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