Malicious PDF — malware analysis report

Static analysis result for SHA-256 846a917e4b70b3bc…

MALICIOUS

PDF

43.2 KB Created: 2020-08-07 16:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e84db54dd763622619d604a17e66815e SHA-1: 1f234a837ccfd18fb19dc4eed2fc9bf36bbcc3e4 SHA-256: 846a917e4b70b3bc40238e5205b1fd1c480a7fe6c382c7a2d2737e2307d8f9e7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though partially corrupted, suggests a lure related to 'important vocabulary for ielts speaking pdf'. The presence of many external PDF links, some hosted on potentially compromised Shopify domains, indicates a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.com/pify?keyword=important+vocabulary+for+ielts+speaking+pdf
    • http://pewiwekit.vailhalla.com/uploads/1/3/0/7/130775734/2868690.pdf
    • http://files.bratrudgolfcars.com/uploads/1/3/1/4/131407692/bufatuwi.pdf
    • http://files.mbabechuk.com/uploads/1/3/1/3/131384468/worepobegisalo.pdf
    • http://files.ugadeltaphilambda.org/uploads/1/3/1/4/131453588/917878.pdf
    • http://warenejes.andrewtozerfineart.com/uploads/1/3/1/6/131637309/4289195.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9277/0977/files/45477518865.pdf
    • https://cdn.shopify.com/s/files/1/0432/4681/3346/files/franklin_covey_planner.pdf
    • https://cdn.shopify.com/s/files/1/0435/5837/1496/files/galofosulu.pdf
    • https://cdn.shopify.com/s/files/1/0440/8963/9077/files/22272663943.pdf
    • https://cdn.shopify.com/s/files/1/0428/1185/0918/files/pazemufopusizanixoxepedew.pdf
    • https://cdn.shopify.com/s/files/1/0431/8330/8962/files/lesulojosi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6057/5912/files/mexerosowow.pdf
    • https://cdn.shopify.com/s/files/1/0427/8901/1612/files/jekurisusog.pdf
    • https://cdn.shopify.com/s/files/1/0436/9648/8613/files/58526170469.pdf
    • https://cdn.shopify.com/s/files/1/0432/7017/6932/files/epsilon_not_value.pdf
    • https://cdn.shopify.com/s/files/1/0438/0501/6225/files/43588615336.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/56925613193.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006924.bin
6c448b37899a9302a61b8bc2fb8c3c82af99f0d2926b2736d26eab5606b5072d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6924 5780 bytes
font_01_sfnt_off00007cc6.bin
1e714974d58502ab474f55d785b7b67e05ea0a9c3dffb56136e01c32166587fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CC6 10256 bytes

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