Malicious PDF — malware analysis report

Static analysis result for SHA-256 815e0d4499356922…

MALICIOUS

PDF

32.3 KB Created: 2020-08-29 13:41:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbcfc0c2ba9e1e033490f0ceebc9499f SHA-1: 2e5c4c54953bdeb6f0ea5d976bfc623a4f58b0fe SHA-256: 815e0d4499356922d7d3b6d33e0465060486bc5c7de66913e6bf792546b106e3
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure related to a financial institution ('Sucursal 3607 bancomer'). The ML classifier also strongly indicated maliciousness. The primary IOC is the redirector URL, which is likely used to host or deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.ru/wix?keyword=sucursal+3607+bancomer
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_f63b7dda1d4145da991c40674ec6acab.pdf
    • https://static.usrfiles.com/ugd/b8c837_73b8128cf8eb4dcb8ecc122c4325285c.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f101c8895c3488fb6efeae3b08f62b0.pdf
    • https://static.usrfiles.com/ugd/cbe7f7_a44de3ae770e4f26938fd23aeced3880.pdf
    • https://static.usrfiles.com/ugd/b8c837_0b5c84a9abae4ccda056b9ca426630ea.pdf
    • https://static.usrfiles.com/ugd/b8c837_c8284ad6a669425290722b4b9a89f674.pdf
    • https://static.usrfiles.com/ugd/b8c837_2543ab1ed7d14a999ebfdb3c54418f23.pdf
    • https://static.usrfiles.com/ugd/b8c837_492497955d6049b1af9958149695b4b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_d76afc95570843bbb83e292015836584.pdf
    • https://static.usrfiles.com/ugd/b8c837_afc8f188e4a548d1bacb7fcad7aeffd4.pdf
    • https://static.usrfiles.com/ugd/b8c837_8293bfba00a947cc9dd9fa0d1af5cd18.pdf
    • https://static.usrfiles.com/ugd/b8c837_9230c86d10a04fcba2dab7aade11405f.pdf
    • https://static.usrfiles.com/ugd/b8c837_755704f540af4d7bb0e46674b279632e.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_off00004145.bin
76dcbdc217ca01edaebdc781cc50ed54198fb7699c1546eb20d0bcff3c0c7299		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4145 5728 bytes
font_01_sfnt_off0000549c.bin
b9c17d4c280dc6754ab21559322b7b981cc27db398caa12dd3f35ac93fd13732		 pdf-font-stream PDF embedded font (sfnt) at offset 0x549C 9364 bytes

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