Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55c8d46959a831c…

MALICIOUS

PDF

46.8 KB Created: 2020-08-18 17:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 990182446a306abe3a9e6e257afdf3ea SHA-1: 436701dfc16b8676243ae543a9de391e1d37a280 SHA-256: d55c8d46959a831cca4ea62b73b9825fa90bae9b2d60ada1110100fe131156d9
150 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it's a redirector link to known malicious infrastructure. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to Shopify-hosted PDFs. The primary malicious URL identified is https://ttraff.ru/pify?keyword=cineform+cfhd+codec, which likely serves as a lure to a malicious site.

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=cineform+cfhd+codec
    • http://files.shellystill.co.uk/uploads/1/3/1/8/131856306/petuwusenalogi.pdf
    • http://files.norbertdelacruziii.com/uploads/1/3/1/3/131379718/9067480.pdf
    • http://files.alpacacomputing.com/uploads/1/3/0/7/130774969/8744627.pdf
    • http://xanune.canadaslegalconnection.com/uploads/1/3/1/6/131637254/zuvojejagomano-tojalulowirovu-raxexelu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8807/7209/files/jemutanuvedejelub.pdf
    • https://cdn.shopify.com/s/files/1/0433/1785/4373/files/ronedat.pdf
    • https://cdn.shopify.com/s/files/1/0429/0461/7119/files/51465056065.pdf
    • https://cdn.shopify.com/s/files/1/0435/8130/9085/files/vikings_season_3_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/4417/5013/files/kezuxulun.pdf
    • https://cdn.shopify.com/s/files/1/0447/3955/9573/files/algebra_questions_year_6_sats.pdf
    • https://cdn.shopify.com/s/files/1/0431/9261/5073/files/simon_ielts_writing_band_9.pdf
    • https://cdn.shopify.com/s/files/1/0432/1892/7776/files/texid.pdf
    • https://cdn.shopify.com/s/files/1/0429/3636/9318/files/animated_desktop_backgrounds_free.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_off000077aa.bin
4416a0e2d1170e8b9ad7b2b31732e0bd15729afc6f0e61da192d681446d183d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77AA 4744 bytes
font_01_sfnt_off0000879a.bin
2d447d84d4540a618d73d41854bfd6f955c0cfab92d468875a58900ebe145525		 pdf-font-stream PDF embedded font (sfnt) at offset 0x879A 11676 bytes

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