Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a443fa1685ee79…

MALICIOUS

PDF

48.0 KB Created: 2020-08-28 09:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1122546c129a4c9d80b47555ec517acb SHA-1: 3b275c35b88e76a876be30314f27196b53a1b704 SHA-256: e9a443fa1685ee797f0d830977e7670f3f7697125bd9615a9d14d3b139e6fed1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=human+body+anatomy+in+tamil+pdf'. The document body, though heavily obfuscated, also contains this URL and other links pointing to what appears to be a link farm designed for SEO manipulation. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used for malicious redirection.

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.ru/pify?keyword=human+body+anatomy+in+tamil+pdf
    • http://files.dkgthetazeta.org/uploads/1/3/2/7/132740398/b38ceeea5557ba.pdf
    • http://files.foodloveblog.com/uploads/1/3/1/3/131380868/vosirijofa.pdf
    • http://files.mrsemsmathmayhem.com/uploads/1/3/1/6/131637014/08d6b.pdf
    • http://nukedo.safe-t-stepper.com/uploads/1/3/1/6/131606000/nefero.pdf
    • http://pivemon.eves-garden.info/uploads/1/3/1/3/131380160/lerurud.pdf
    • https://cdn.shopify.com/s/files/1/0431/0741/8274/files/social_psychology_myers_11th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/8940/2783/files/bestiario_libro.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rafudegilezenetizaxesuvos.pdf
    • https://cdn.shopify.com/s/files/1/0437/5520/8858/files/63529267525.pdf
    • https://cdn.shopify.com/s/files/1/0428/5913/5132/files/49109091529.pdf
    • https://cdn.shopify.com/s/files/1/0433/8073/6165/files/dugupezulinuruguruvu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4481/4500/files/fefovifuzitotowepilativiv.pdf
    • https://cdn.shopify.com/s/files/1/0432/5592/2852/files/ranikunilizovil.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vabagibad.pdf
    • https://cdn.shopify.com/s/files/1/0432/8754/3964/files/whirlpool_cabrio_washer_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/6978/2693/files/wipevijozopivepe.pdf
    • https://cdn.shopify.com/s/files/1/0439/9605/3662/files/firixasosab.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006db3.bin
58b621e40e22c3bcc57f80275981510bc3129017690156d882933bf4ccb242cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB3 5116 bytes
font_01_sfnt_off00007f04.bin
492b45c4f41caee2aed76609f589ff7a3ef1f7c754d855ae3528087e089a44ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F04 5152 bytes
font_02_sfnt_off000090c8.bin
3cd3ea44c84321f825edd4234b3f7209aaf4b8aee8bf8f8f5a6b55fc4e8e9165		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90C8 10128 bytes

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