Malicious PDF — malware analysis report

Static analysis result for SHA-256 a234bc97d042d260…

MALICIOUS

PDF

46.0 KB Created: 2020-09-03 05:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb4cad7fcedc8f64a4e4a7d32b477698 SHA-1: 6b88d656b04ba0082c1a1391d80d9b482a28bfe4 SHA-256: a234bc97d042d2607e059c02483ceb37932ace070d0ca9132045f1a22c3f977b
150 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting it is a 'First aid guide' and includes the malicious URL. This indicates a social engineering lure to redirect users to a harmful site.

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=first+aid+guide+vanilla+1-+300
    • https://cdn.shopify.com/s/files/1/0435/7806/5055/files/28209277065.pdf
    • https://cdn.shopify.com/s/files/1/0436/5379/1909/files/camera_translate_android_github.pdf
    • https://cdn.shopify.com/s/files/1/0438/4620/5602/files/safagulowirera.pdf
    • https://cdn.shopify.com/s/files/1/0436/0005/2387/files/sijobe.pdf
    • https://static.usrfiles.com/ugd/c7a620_a115f73bd1084f39981b04fb9ba18e89.pdf
    • https://static.usrfiles.com/ugd/8b4172_c401a312f0484650902888e1e8cb32fb.pdf
    • https://cdn.shopify.com/s/files/1/0428/1293/2255/files/zerusavekojisexulud.pdf
    • https://cdn.shopify.com/s/files/1/0432/2626/7816/files/unix_linux_administration_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8106/files/electronic_measurements_and_instrumentation_textbook.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_off00007600.bin
4c5eebd2348ef4b227da7de57b6411b1fffa63bfbcca39053fbb42d0f21e2480		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7600 5396 bytes
font_01_sfnt_off0000887b.bin
6569b6318215858c1d4dc4c2cbcc4721e82c0decbb4931fd300decef84d8c706		 pdf-font-stream PDF embedded font (sfnt) at offset 0x887B 10224 bytes

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