Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8cf3f76e8c479d6…

MALICIOUS

PDF

55.4 KB Created: 2020-08-21 06:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c27d097b48f82f0371eeb8504f974e22 SHA-1: 54b4f7d5539a0d99c4e344665ba47a4b1b95cbc8 SHA-256: e8cf3f76e8c479d6d3b9d0cee89b5854e2a0b325b81cd3bb012337fb451fe904
150 Risk Score

Malware Insights

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

The PDF file contains numerous links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL as the malicious redirector, suggesting an attempt to lure users to malicious infrastructure. The ML classifier also flagged this PDF as malicious. No scripts were extracted from this sample.

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.ru/pify?keyword=adding+fractions+whole+numbers+worksheets
    • http://files.nomadicwellness.com/uploads/1/3/1/3/131380841/533a358d324aa1.pdf
    • http://files.minnesotadivingacademy.com/uploads/1/3/0/7/130739892/3f50bbe47bfd.pdf
    • https://cdn.shopify.com/s/files/1/0437/5317/7237/files/excel_sheet_filter_shortcuts.pdf
    • https://cdn.shopify.com/s/files/1/0432/1338/9992/files/audiometry_graph_template.pdf
    • https://cdn.shopify.com/s/files/1/0440/7967/7590/files/jolly_phonics_letter_n_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0429/2067/3433/files/morally_noun_form.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3669/files/girawi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9510/files/17920158574.pdf
    • https://cdn.shopify.com/s/files/1/0441/0851/3432/files/fiitjee_admission_test_sample_papers_for_class_10.pdf
    • https://cdn.shopify.com/s/files/1/0437/6847/9898/files/trastorno_esquizofrenia_paranoide.pdf
    • https://cdn.shopify.com/s/files/1/0428/3056/1436/files/visumuwawuxugozam.pdf
    • https://cdn.shopify.com/s/files/1/0439/2668/3816/files/the_terminator_3_parents_guide.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_off00008699.bin
e12f625a6053cc1e09aca0b536711679e9a695c8303f64cb0b660f6a12d0d618		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8699 5720 bytes
font_01_sfnt_off000099e6.bin
0368240da0b71a88d89960aceaa4e8ab8b496c4960795b3063fd4fb2b9918407		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99E6 9712 bytes
font_02_sfnt_off0000bb67.bin
64e13322576ebe4b9a20b8efdba1cb2c8bc01163a7c4e1ba1f667a2d7cf8e6df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB67 16116 bytes

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