Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf21e58fd1eff522…

MALICIOUS

PDF

39.8 KB Created: 2020-08-12 16:40:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b5636cdf028c58d3b3f416972f2832f SHA-1: b8708466695456804b787504ffbd7a0bc74ee243 SHA-256: bf21e58fd1eff5225f4dce8a7276b0be86fb58a92403bcd934139956e6d54953
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, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL and text related to ukulele chords, suggesting a lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify, likely to obscure the malicious redirector. The ML classifier strongly flagged this PDF as malicious.

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=can+t+help+falling+in+love+ukulele+chords+pdf
    • http://files.aofeathers.com/uploads/1/3/1/3/131398605/sukosagosomuz-rofagidib-nibis.pdf
    • http://files.seinnnanog.com/uploads/1/3/1/8/131871740/56436190936.pdf
    • http://files.nicaraguaforchrist.com/uploads/1/3/0/8/130874246/jimusefufigupub.pdf
    • http://files.freestylefitness.nl/uploads/1/3/1/4/131406811/8700030.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8699/files/canon_in_d_classical_guitar_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0435/2265/4362/files/17924455966.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6566/files/negezimosob.pdf
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/67013548067.pdf
    • https://cdn.shopify.com/s/files/1/0436/1011/2163/files/catenary_equation.pdf
    • https://cdn.shopify.com/s/files/1/0435/6915/2159/files/62763980604.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/pafozirez.pdf
    • https://cdn.shopify.com/s/files/1/0430/1655/2605/files/81283423117.pdf
    • https://cdn.shopify.com/s/files/1/0432/7361/7568/files/restaurant_inventory_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/7003/6904/files/ors_ogden_utah.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/nukifelubopixupixofi.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_off00005049.bin
93d0b310d1be6f6f876d4be2f7c1e77a35510b5226be396e7e0577e9117dc448		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5049 5444 bytes
font_01_sfnt_off000062d7.bin
c373851653972292d31865cf12bd0ef2bfeff1026d0f1627d5966774319b4a06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62D7 14536 bytes

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