Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b4265a2639f991…

MALICIOUS

PDF

47.4 KB Created: 2020-08-05 09:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba0a857bb0d63a0e4ab2261c832c866c SHA-1: c5b681bb373a9d22cf9e9261bb675ab587be8562 SHA-256: 33b4265a2639f991b16340f5ccd8b44b66188540f558a100c65e563011a52807
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, a technique often used for SEO spam or to redirect users to malicious sites. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically identifies a link to ttraff.ru, which is known malicious infrastructure. The document body, though heavily obfuscated, contains text related to 'Bangla calendar 2020 pdf download' and the authoring application 'wkhtmltopdf', suggesting a lure to download a PDF. The presence of many Shopify URLs, some marked as benign, alongside the malicious redirector, indicates a link farm strategy.

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=bangla+calendar+2020+pdf+download
    • http://files.ballaratorphanagechildrenshome.com/uploads/1/3/0/7/130739463/dekoboxi.pdf
    • http://files.artofceremony.co.uk/uploads/1/3/1/8/131872178/7b72fe2b4162fd9.pdf
    • http://files.broadwaysupplystore.com/uploads/1/3/1/4/131409309/sasafixa-xigopabowi-lumukebevozeko.pdf
    • http://files.goacesfootball.com/uploads/1/3/1/3/131383424/6955055.pdf
    • http://files.hoopspulse.com/uploads/1/3/0/7/130739027/xidijexe.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/200349851.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/84602765162.pdf
    • https://cdn.shopify.com/s/files/1/0428/3056/1436/files/14268134891.pdf
    • https://cdn.shopify.com/s/files/1/0435/5381/6728/files/13643936021.pdf
    • https://cdn.shopify.com/s/files/1/0434/3198/5309/files/12645308849.pdf
    • https://cdn.shopify.com/s/files/1/0429/1887/1207/files/92436441225.pdf
    • https://cdn.shopify.com/s/files/1/0428/6581/9814/files/37932066265.pdf
    • https://cdn.shopify.com/s/files/1/0436/7230/5817/files/20546126911.pdf
    • https://cdn.shopify.com/s/files/1/0433/3495/9259/files/ss_bolt_tightening_torque_chart.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/72087367130.pdf
    • https://cdn.shopify.com/s/files/1/0433/9322/0758/files/94486450650.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fe9.bin
2fdd1d67916ec16c0c439f4254355c67a17bd0c4c8c99f9542bb6912fed88bbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE9 5560 bytes
font_01_sfnt_off000072f9.bin
c9ae5a18bd10a721bc6e3af02f3058d5623b610f7c80b8f2bd883ec92d9ab911		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72F9 4888 bytes
font_02_sfnt_off000082aa.bin
219c50eb5f9de54547e75882c5791e81fccadeb83f743dbd1d6da3bbbca1c2be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82AA 1912 bytes
font_03_sfnt_off00008beb.bin
34af7b96fdaf3ac92113812d66410091bc094bafd4fff805642da613b6bac99e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BEB 10492 bytes

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