Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52055fc55ec9d1e…

MALICIOUS

PDF

48.9 KB Created: 2020-08-09 17:40:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8a431e4d5aad41515af0e8e84fe8ec7 SHA-1: 6e4ee5a410b2965038f4011f3ee2a280daff64ac SHA-256: f52055fc55ec9d1eb21d35f52d6ba5465c07c75e895226e243a55073a63a67a9
150 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, a common tactic for SEO poisoning and redirecting users to malicious sites. The primary link, 'https://ttraff.ru/pify?keyword=agricultural+economics+research+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting the intent is to lure the user into clicking through to a potentially harmful destination. The ML classifier also strongly indicated maliciousness.

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=agricultural+economics+research+pdf
    • http://files.fmbxoriginate.co.uk/uploads/1/3/1/4/131454352/9357912.pdf
    • http://files.psychometricdynamics.com/uploads/1/3/1/4/131409244/goviliraliv.pdf
    • http://files.brightonpetcare.com/uploads/1/3/2/3/132303329/vejapi.pdf
    • http://files.knotinstylesolutions.com/uploads/1/3/1/4/131407102/fodonejejokiropuvafa.pdf
    • https://cdn.shopify.com/s/files/1/0436/8403/6761/files/20741019306.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9652/files/cursive_letter_chart.pdf
    • https://cdn.shopify.com/s/files/1/0436/6965/1606/files/46344766353.pdf
    • https://cdn.shopify.com/s/files/1/0438/5121/9104/files/42575196639.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/13127668683.pdf
    • https://cdn.shopify.com/s/files/1/0431/3320/6682/files/nctb_books_of_class_11_12_english_version_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vakijuxek.pdf
    • https://cdn.shopify.com/s/files/1/0431/2317/9677/files/vuxexes.pdf
    • https://cdn.shopify.com/s/files/1/0438/1710/7616/files/zafazadoko.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_off0000725e.bin
007ddc84fa87daa16cc1bf9b033e0e8b3dc11b36d4a915ea96dbc146b1ca2734		 pdf-font-stream PDF embedded font (sfnt) at offset 0x725E 5556 bytes
font_01_sfnt_off0000851d.bin
f8c396cf26c6f67323cb1457d220832524bc3de7d641318ea34958ef5512cf46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x851D 16304 bytes

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