Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f055661c7b1defc…

MALICIOUS

PDF

46.6 KB Created: 2020-08-05 18:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07e821a0f7ffb839f9429309658e77ba SHA-1: 6e51294825e91ba8ee7839d1b80dd3b94b6b7d4b SHA-256: 4f055661c7b1defc3666d8d8d7187234fe6f30e6dceabdc0e0de9765504fb31e
152 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Shopify domains, likely as part of an SEO link farm to promote the malicious redirector. The primary malicious URL, 'https://ttraff.com/pify?keyword=botany+pdf+books', is identified as a known malicious redirector. The document body, though heavily obfuscated, contains references to 'Botany pdf books' and the wkhtmltopdf application, suggesting a lure for users seeking such 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=botany+pdf+books
    • http://widim.madisonmedium.com/uploads/1/3/1/4/131408899/7749567.pdf
    • http://laket.kellybellecrystals.com/uploads/1/3/0/7/130776757/luzilewo-xufepemokara-taseloxon.pdf
    • http://files.adarksouvenir.com/uploads/1/3/0/7/130775102/xonasovolejanuzed.pdf
    • http://files.supplydeskhavering.com/uploads/1/3/2/6/132695554/e03646db08a217.pdf
    • https://cdn.shopify.com/s/files/1/0430/0849/1673/files/96600052736.pdf
    • https://cdn.shopify.com/s/files/1/0437/4138/0759/files/ficha_hemerografica_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0439/0620/3803/files/calendario_lunar_2020_em.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9652/files/fuvopurobir.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/71567092846.pdf
    • https://cdn.shopify.com/s/files/1/0429/9236/9823/files/widepigikuxofuki.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/40814320730.pdf
    • https://cdn.shopify.com/s/files/1/0432/4586/3067/files/5349060545.pdf
    • https://cdn.shopify.com/s/files/1/0428/0185/6668/files/pull_up_wiz_khalifa_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/9648/7576/files/xejadajenuzebuzizajaseguf.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5018/files/fuvezol.pdf
    • https://cdn.shopify.com/s/files/1/0440/5100/5590/files/disturbios_adrenais.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/
    • https://cdn.shopify.com/s/files/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c68.bin
609eb4fce99eaf76722ce8f5069b900424398059d77923b5457cf45334272ed8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C68 5264 bytes
font_01_sfnt_off00007e70.bin
73369a0474f52040398817bd819a9003d7b199c8e721d069070f705e4ee47f9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E70 14956 bytes

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