Malicious PDF — malware analysis report

Static analysis result for SHA-256 54139761dc46e9fb…

MALICIOUS

PDF

33.4 KB Created: 2020-08-22 23:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b3b28cdb2c1d68d77b6170fe2a02392 SHA-1: ea0b86505983430393ccb23834a0b42c3d2de548 SHA-256: 54139761dc46e9fb84b6b05775171e39aaf232dbe616a436fd2593ee39970070
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the target URL 'https://ttraff.com/pify?keyword=kimimaro+theme+piano+sheet' and numerous other PDF links, suggesting a phishing or redirection attempt. The ML classifier strongly supports the malicious verdict.

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.com/pify?keyword=kimimaro+theme+piano+sheet
    • http://files.nailandbeauty.co.nz/uploads/1/3/1/4/131453402/tefelisul.pdf
    • http://xejaxu.foodlust.net/uploads/1/3/0/7/130775320/wajakagami-vadomujafuronod-wakas-fabipo.pdf
    • http://darona.ephesians320ministries.org/uploads/1/3/0/8/130813747/kavuni_zabage.pdf
    • http://files.devonportcomhouse.com/uploads/1/3/0/7/130739593/3e4331.pdf
    • http://files.klasifiedco.com/uploads/1/3/1/6/131606000/6554575.pdf
    • https://cdn.shopify.com/s/files/1/0431/4421/6727/files/shorthold_tenancy_agreement_template.pdf
    • https://cdn.shopify.com/s/files/1/0435/9376/0931/files/job_interview_vocabulary_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0435/6843/1265/files/35999454318.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/93324823759.pdf
    • https://cdn.shopify.com/s/files/1/0434/4987/6630/files/20071286777.pdf
    • https://cdn.shopify.com/s/files/1/0437/6926/6325/files/v20_rites_of_the_blood.pdf
    • https://cdn.shopify.com/s/files/1/0427/9812/1119/files/printable_english_grammar_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/3957/1611/files/social_impact_of_globalization.pdf
    • https://cdn.shopify.com/s/files/1/0435/0754/8326/files/wei_wu_wei.pdf
    • https://cdn.shopify.com/s/files/1/0428/7476/5475/files/nibuwadopajuko.pdf
    • https://cdn.shopify.com/s/files/1/0437/8587/9713/files/guia_para_aprender_ingles_sozinho.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_off000047e4.bin
77ececfaaa4e291dc061958f71d2fd1f8ea5e2d2bc9a56b966866cf112ed172c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47E4 4996 bytes
font_01_sfnt_off000058b5.bin
304cd75d2caf546bdf6b2cad6737de86ae1dbaa0ee47de00d98ae897082a5750		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58B5 9332 bytes

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