Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66eacb1f52ef9e1…

MALICIOUS

PDF

41.0 KB Created: 2020-08-31 02:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c92cf374c51a999f8045955a9825310 SHA-1: 234d0daad8877e5ff2b7212c7bf3e2c842825bb6 SHA-256: b66eacb1f52ef9e16c8e756f21d66408d7a63587650d53c3e3e0839c38076bef
150 Risk Score

Malware Insights

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

The PDF document was flagged as malicious due to a critical heuristic identifying a link to a known malicious redirector. Additionally, another critical heuristic detected a mass external PDF link farm, suggesting an attempt to manipulate search engine results or distribute content broadly. The ML classifier strongly supports the malicious verdict. The primary malicious IOC is the redirector URL, which likely serves as a gateway to further malicious activity.

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=legion+blatty+novel%2529
    • https://static.usrfiles.com/ugd/b8c837_14123bb2b7df4f5b8bded97bc6a65de2.pdf
    • https://static.usrfiles.com/ugd/5de1df_22b8e45d4384473ca535eb47793f881f.pdf
    • https://static.usrfiles.com/ugd/b8c837_9ee590db22b0406ab72ad62683a0418b.pdf
    • https://cdn.shopify.com/s/files/1/0437/6874/2040/files/50028157235.pdf
    • https://cdn.shopify.com/s/files/1/0430/9486/8122/files/xomegiwimajowinaxonasevop.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/34530012154.pdf
    • https://static.usrfiles.com/ugd/ea2f88_b00978897c3d4018a9b70c86786e8134.pdf
    • https://static.usrfiles.com/ugd/3ceeb9_1fe579421d1a4bab89290048f3ad5898.pdf
    • https://static.usrfiles.com/ugd/b88e3d_c297503cb8d84d5e978c7cbf0febda1e.pdf
    • https://cdn.shopify.com/s/files/1/0435/8383/2227/files/ncert_chemistry_textbook_class_12_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/1297/9879/files/nhy_n_flash_khi_c_cuc_gi_n_o.pdf
    • https://cdn.shopify.com/s/files/1/0432/5100/7638/files/34105887404.pdf
    • https://cdn.shopify.com/s/files/1/0434/7016/0032/files/rekuzezifa.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_off00006331.bin
1a6e820792cbb6d038f589a515ec7b9a48802db81561e9b7f400e78699f64c99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6331 4896 bytes
font_01_sfnt_off00007410.bin
b57e0769074e9eab841f7619e560821a90e8e53e74f558442c3864c7ca4f7572		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7410 10376 bytes

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