Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e78b45ecf21b1fd…

MALICIOUS

PDF

123.5 KB Created: 2020-08-16 21:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5bfc2fafd950e20d7fb5a6f1ca94bed0 SHA-1: 0145a0dc61e5775996f38a3c29b856625a9e96cf SHA-256: 7e78b45ecf21b1fd57166ed0f66426ab32db837a1c53c12eaf1ed2a9a74ede69
120 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a search result for medical guidelines. The document body, though heavily obfuscated, contains the target URL. The PDF was generated using wkhtmltopdf, a tool sometimes used to create malicious documents. The presence of a link farm heuristic further indicates a malicious intent to drive traffic through redirectors.

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=valvular+heart+disease+guidelines+2017+aha
    • http://files.apostolicdeliverancefive.org/uploads/1/3/1/1/131163904/2916a.pdf
    • http://bewalep.lifeasabowhunter.com/uploads/1/3/0/9/130969634/8942486.pdf
    • https://cdn.shopify.com/s/files/1/0433/9000/9502/files/41843500384.pdf
    • https://cdn.shopify.com/s/files/1/0437/2804/4193/files/types_of_nut_bolts.pdf
    • https://cdn.shopify.com/s/files/1/0434/6544/1430/files/bidurolobiwajufo.pdf
    • https://cdn.shopify.com/s/files/1/0435/6459/7397/files/agricultural_engineering_projects_topics.pdf
    • https://cdn.shopify.com/s/files/1/0428/7492/9319/files/39169314413.pdf
    • https://cdn.shopify.com/s/files/1/0451/0108/8921/files/betujufoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/7449/4369/files/anorexia_y_bulimia_oms_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1642/files/high_voltage_breakdown_tester.pdf
    • https://cdn.shopify.com/s/files/1/0432/2924/9694/files/capitalism_socialism_communism.pdf
    • https://cdn.shopify.com/s/files/1/0436/2669/2771/files/tunuwazam.pdf
    • https://cdn.shopify.com/s/files/1/0435/3579/4340/files/muscle_gain_workout_plan.pdf
    • https://cdn.shopify.com/s/files/1/0429/7005/4805/files/wusasesap.pdf
    • https://cdn.shopify.com/s/files/1/0437/6874/2040/files/88003415676.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_off0001a433.bin
20acd77f25bb0c7b83ef043bd5ea6ea190cacca2da7ce188567bd402cced760f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A433 5520 bytes
font_01_sfnt_off0001b6fe.bin
f330eced8fe912e27ea5305dc50f8a2ccaa528fc65391d33c7eb80f329cd83aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6FE 13192 bytes

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