Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c4a2e6684bb5cd…

MALICIOUS

PDF

43.9 KB Created: 2020-08-29 21:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94bf017d56e0546198e5ae6a581d836c SHA-1: b409a831fb1f432878b951b81f9a0c7a441ed635 SHA-256: 73c4a2e6684bb5cd82a6c0e811fc4d7afaf222804e2cd4f96966a89d65be8605
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, suggesting it is the primary lure. The ML classifier also flagged this PDF as malicious with high confidence. The presence of embedded URLs and the nature of the redirector indicate an attempt to lead the user to a malicious site, likely for phishing or malware delivery.

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.com/wix?keyword=lenovo+ideapad+s415+touch
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31056735454.pdf
    • https://cdn.shopify.com/s/files/1/0430/6694/9799/files/26438441137.pdf
    • https://cdn.shopify.com/s/files/1/0434/8860/8418/files/linear_equation_in_two_variables_worksheet.pdf
    • https://static.usrfiles.com/ugd/b8c837_32307e46f22b4d13a12dade640d34f83.pdf
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/39291783662.pdf
    • https://cdn.shopify.com/s/files/1/0440/7810/4728/files/adobe_converter_login.pdf
    • https://static.usrfiles.com/ugd/e32576_ecbb3a16473140b098e966575f498e31.pdf
    • https://static.usrfiles.com/ugd/b8c837_247d56bc31a6445ba8ef163b96597c42.pdf
    • https://static.usrfiles.com/ugd/b8c837_56e2a992cd1648e79a269c6445757132.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006425.bin
ddb6b78020238d62c0acd12221ab21d8c827ea0413ccd3a195b43f57b8b8958a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6425 5300 bytes
font_01_sfnt_off00007644.bin
0f9709c68c283b9cd13efd813816ed1ab589e53f5bc0a5cd1a19f35eae105224		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7644 13996 bytes

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