Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8340d4e57c36148…

MALICIOUS

PDF

41.5 KB Created: 2020-09-16 15:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03c36b058a444bc81a05c287e572b8a5 SHA-1: 79baca6a5ad9b876caa58171d787415df540a6ad SHA-256: f8340d4e57c36148f50dfb1413f4ca463087a785b605c2ddb080333b32c08a5d
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm, indicating a spam or phishing attempt. The embedded URLs, such as 'https://ttraff.ru/wix?keyword=minecraft+middle+school+math', are likely part of a campaign to drive traffic to malicious sites. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=minecraft+middle+school+math
    • http://files.kilrushns.ie/uploads/1/3/1/6/131636651/xupaxisomo_nopatu_kilikujuramax_beraje.pdf
    • http://zalapiwa.deckleedgeco.com/uploads/1/3/1/6/131637814/c3e5c7.pdf
    • https://2e555c66-c733-4bda-8595-e34f8dd3db30.filesusr.com/ugd/d43733_d835b02a09dc4030b8f9c82b8828b194.pdf?index=true
    • https://70c59834-733b-430b-a8ef-7ac1fa6bff43.filesusr.com/ugd/b56239_e0e154d8f7994e8e94d37cc93a42e453.pdf?index=true
    • https://93489786-82ea-4745-87b8-9377a8decd65.filesusr.com/ugd/c722c2_d39b0cfd0d674df998d0cb1c639d29b3.pdf?index=true
    • https://d3bc46a1-fc9e-497d-b119-330a09bc411e.filesusr.com/ugd/dcf311_e8605753c149440c998640087f599523.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0432/4202/9215/files/android_emulator_linux_genymotion.pdf
    • https://cdn.shopify.com/s/files/1/0431/1633/1172/files/99699379956.pdf
    • https://cdn.shopify.com/s/files/1/0432/4353/6552/files/operations_with_rational_numbers_worksheet_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0438/5056/3734/files/mamawego.pdf
    • https://cdn.shopify.com/s/files/1/0429/1775/7095/files/concerning_hobbits_flute.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_off00006543.bin
06b21e0f59637c86f81708b5c94e8a8afe6481f1c985228984a509243b11684f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6543 5264 bytes
font_01_sfnt_off00007708.bin
260ed530cee031e913490e17fd5e9caad29083ade52e02a8baa648cdc9ef011a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7708 10248 bytes

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