Malicious PDF — malware analysis report

Static analysis result for SHA-256 59174d1f073e4a0d…

MALICIOUS

PDF

40.7 KB Created: 2020-08-12 04:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe75c3742210fe718488f96e931cbfd3 SHA-1: 1ae1adc127759a999e17692e2cdd3911e1a12f7e SHA-256: 59174d1f073e4a0d8f4b350436e836fca6e826ab882834c994391b5363f38d33
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, 'https://ttraff.ru/pify?keyword=year+7+math+worksheets+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure under the guise of providing educational worksheets.

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=year+7+math+worksheets+pdf
    • http://files.chicagoschoolofgrappling.com/uploads/1/3/1/4/131409170/312064.pdf
    • http://files.well-estar.com/uploads/1/3/1/6/131637034/91a0067.pdf
    • http://files.lifeandpeacephoto.com/uploads/1/3/2/3/132303248/e9ad73ef5aca11.pdf
    • http://files.badappleorchard.net/uploads/1/3/1/1/131164250/9629095.pdf
    • http://files.waiheelimu.org/uploads/1/3/1/6/131607174/nomuvawezilamaranu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0490/3067/files/95810012005.pdf
    • https://cdn.shopify.com/s/files/1/0437/6884/0341/files/european_date_format.pdf
    • https://cdn.shopify.com/s/files/1/0432/6139/5102/files/8975776724.pdf
    • https://cdn.shopify.com/s/files/1/0437/4573/8903/files/smi_to_srt.pdf
    • https://cdn.shopify.com/s/files/1/0437/2132/6742/files/85369088866.pdf
    • https://cdn.shopify.com/s/files/1/0431/7069/3284/files/english_to_german_language_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0433/8306/2678/files/allotment_planner.pdf
    • https://cdn.shopify.com/s/files/1/0430/0580/4698/files/23131036828.pdf
    • https://cdn.shopify.com/s/files/1/0429/4888/6684/files/87121551710.pdf
    • https://cdn.shopify.com/s/files/1/0430/7497/7945/files/50598116779.pdf
    • https://cdn.shopify.com/s/files/1/0437/9249/8850/files/zajulofija.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_off00006076.bin
ce70e7ca51ba2d2b5d4a7ca9fb939490b5b170def1e4c84bae9002f2d90582f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6076 5444 bytes
font_01_sfnt_off000072f6.bin
5e284581e33a39c03a56dcbeebec7a971b7bb73c086603019daa6fb6b395835a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72F6 10348 bytes

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