Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ea15e48579eb87…

MALICIOUS

PDF

41.7 KB Created: 2020-08-29 06:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd59680b0af8b7eda52a646c19373f1b SHA-1: d13007019bc743d4f9c17aceacc5b8e81a32a31a SHA-256: f1ea15e48579eb877cfd368442427e4de71b9436e7046eee1402b29469805d6b
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded external links, with a critical heuristic firing for a PDF link farm. One of the primary links, 'https://ttraff.cc/wix?keyword=el+pr%2525C3%2525ADncipe+de+las+mareas', is flagged as malicious, indicating a likely redirection to harmful content. The document body, though heavily obfuscated, also contains this URL, reinforcing its role in the attack. 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.cc/wix?keyword=el+pr%2525C3%2525ADncipe+de+las+mareas
    • https://static.usrfiles.com/ugd/b8c837_702437aa5afd4e388172c573124b41df.pdf
    • https://static.usrfiles.com/ugd/b8c837_b53e9525bd1749be8c2034ce0e38c3fb.pdf
    • https://static.usrfiles.com/ugd/b8c837_82ebb2b9cc4f49bcb732a2ef894610f3.pdf
    • https://cdn.shopify.com/s/files/1/0431/1059/6765/files/tatiku.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9540/files/70481321947.pdf
    • https://cdn.shopify.com/s/files/1/0431/2304/8610/files/financial_times_mba_rankings_2019.pdf
    • https://cdn.shopify.com/s/files/1/0431/4107/1016/files/93026222294.pdf
    • https://static.usrfiles.com/ugd/b8c837_503930efaa134338ab701eb24487daf0.pdf
    • https://static.usrfiles.com/ugd/b8c837_4e7b6f4437a048e1b1b8aa2b02122d92.pdf
    • https://static.usrfiles.com/ugd/b8c837_65257470cdfa4353843b286775c9c074.pdf
    • https://static.usrfiles.com/ugd/b8c837_b5394b67b6eb420ba181c0e7eca91549.pdf
    • https://static.usrfiles.com/ugd/b8c837_acbb15457539486ea5a29a4648c0df70.pdf
    • https://static.usrfiles.com/ugd/b8c837_b8a150c37262438780fc918b9154f90a.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a1106e07fa74690aa14897735df7630.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_off00006241.bin
acab05b4aa9dc16e1db3a89d9df2fbcae4d472d48f8ab275e397d68783dc18b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6241 5228 bytes
font_01_sfnt_off000073ee.bin
e6ae6362425bfa486c335f2ddc95115fa89a6bf145ae255803c09a405e58c815		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73EE 11332 bytes

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