Malicious PDF — malware analysis report

Static analysis result for SHA-256 e31870a793434c52…

MALICIOUS

PDF

38.9 KB Created: 2020-08-29 01:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a5dd1ff4e30d4970d2144a56dadb281 SHA-1: b1085b45245e1363011dd40cd9072abdb9b34043 SHA-256: e31870a793434c5269adb81e7d9dc7049f863e6f910e8d0699ba6912ea6f7c9b
150 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/wix?keyword=DOWNLOAD+VIDEO+DE+GUERRA+A+MERCANO', which is flagged as malicious. Additionally, the PDF includes a large number of embedded links, many pointing to Shopify domains, suggesting a link farm or redirection strategy. The ML classifier also strongly flagged this PDF as malicious.

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.cc/wix?keyword=DOWNLOAD+VIDEO+DE+GUERRA+A+MERCANO
    • https://cdn.shopify.com/s/files/1/0437/3653/1095/files/fezonabefovukekesu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9228/6363/files/51704386519.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/barudipebu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9313/1425/files/nizam_al_mulk_book_of_government.pdf
    • https://cdn.shopify.com/s/files/1/0437/6382/6849/files/dynamic_programming_for_coding_interviews_a_bottom-up_approach_to_problem_solving.pdf
    • https://static.usrfiles.com/ugd/b8c837_4b50c75b0c4f4e008c3dbcb52dc4e5cc.pdf
    • https://cdn.shopify.com/s/files/1/0463/0495/2477/files/manual_de_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0438/1723/8685/files/xkcd_global_warming.pdf
    • https://cdn.shopify.com/s/files/1/0427/6004/4710/files/jexexivajekeb.pdf
    • https://cdn.shopify.com/s/files/1/0438/0993/1426/files/guxifiwasubafo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0477/1999/files/37202190205.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_off00005ac5.bin
2260d2c679e28d200b858fe88feed4794611097ef00ff5c8b58bd1330a1df142		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC5 5136 bytes
font_01_sfnt_off00006c83.bin
f9880782043b6951bb1cdbadc6d2b3c8ebd9c043298d973e72b4ad495063f643		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C83 10068 bytes

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