Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc14fb5a5dbaa06…

MALICIOUS

PDF

47.9 KB Created: 2020-08-21 00:41:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc7e5a1e60571cb766575439edb5c427 SHA-1: b940f4e8f1bce4b9c0b9e850912f3099bbdd1afd SHA-256: bfc14fb5a5dbaa069a2690387921bdd6c19af1c2375f20cb99aa7f9ea9bdca5f
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to external PDF files, which is indicative of a link farm or SEO poisoning tactic. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.ru/pify. The document body, though heavily obfuscated, contains text related to 'teaching business english lesson plans pdf' and the malicious URL, suggesting a lure to drive traffic to malicious sites.

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=teaching+business+english+lesson+plans+pdf
    • http://files.troop502iop.com/uploads/1/3/0/9/130969408/galawudaf-fisojidowulem-xijibosesanozo.pdf
    • http://files.beyondthekitchen.net/uploads/1/3/2/6/132683246/dakomatutax.pdf
    • http://files.healingwisdom5.com/uploads/1/3/0/7/130739704/1955042.pdf
    • http://files.influencingstrategies.com/uploads/1/3/1/4/131453522/7337761.pdf
    • https://cdn.shopify.com/s/files/1/0433/7552/6051/files/from_caligari_to_hitler.pdf
    • https://cdn.shopify.com/s/files/1/0432/3740/8936/files/77610958143.pdf
    • https://cdn.shopify.com/s/files/1/0434/5046/6454/files/6632245317.pdf
    • https://cdn.shopify.com/s/files/1/0440/5228/3542/files/auger_electron_spectroscopy_instrumentation.pdf
    • https://cdn.shopify.com/s/files/1/0438/1537/0912/files/ciencias_sociales_secundaria.pdf
    • https://cdn.shopify.com/s/files/1/0429/4233/3087/files/49310718140.pdf
    • https://cdn.shopify.com/s/files/1/0427/9736/7452/files/52299799097.pdf
    • https://cdn.shopify.com/s/files/1/0439/5122/7048/files/vibozajuvapexulam.pdf
    • https://cdn.shopify.com/s/files/1/0427/4556/1254/files/latuzigifekowapigikukoto.pdf
    • https://cdn.shopify.com/s/files/1/0431/5434/2044/files/calculating_isotopic_abundance_worksheet.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_off00007bc6.bin
dae04855c0fb24243692464601ab723cbcf3f09092b2c96ab02bd5787d03a92d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BC6 5412 bytes
font_01_sfnt_off00008e1b.bin
64afac676dbcdd2b7ca7cf1338b63c720dd41cf962d09b28e479a468884b0ff6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E1B 10740 bytes

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