Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce286d5fcdd88a9…

MALICIOUS

PDF

37.2 KB Created: 2020-08-29 02:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 057d9548c7bd968f3750b59b9682f409 SHA-1: c607c2baaf8557c6fe2fee1a8aa5e17f45b87935 SHA-256: dce286d5fcdd88a9fc3da75b7935b1f9ca45eb956179d85fe40e186b183cf08f
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources. The ML classifier strongly indicates maliciousness. The primary malicious IOC is the redirector URL, which likely serves as a gateway to further malicious content.

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.link/wix?keyword=ejercicios+de+geometria+1+eso
    • https://static.usrfiles.com/ugd/b8c837_2fa5e19c3e874ab1a8b08aba72e3ba99.pdf
    • https://static.usrfiles.com/ugd/b8c837_85e1aaeea572428bad9bc86ed7fca052.pdf
    • https://static.usrfiles.com/ugd/b8c837_e5d7f6f99acb4a2386e3fdfe25fc4430.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c5e88d230c347a6a819567be00ac3b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_a628e339697e410585c0b7a4bc65a5c4.pdf
    • https://static.usrfiles.com/ugd/b8c837_d078420971214a67ad774ede501d4b52.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ed7d066837e47e0b4727a39f1bd04c5.pdf
    • https://static.usrfiles.com/ugd/b8c837_13a468482e48450dbbfc3fc476ab9681.pdf
    • https://static.usrfiles.com/ugd/b8c837_61606fcdfd534038ab0ee0893f09605f.pdf
    • https://cdn.shopify.com/s/files/1/0437/8548/6485/files/didezapibedifi.pdf
    • https://cdn.shopify.com/s/files/1/0427/5575/2103/files/xukokuwabotobomigadujo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8613/5961/files/timex_watch_manual.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_off0000501d.bin
2ea2d763d89eeb7f8d4b3149a5949ec3f7c5232cc0a2104730b21889ca19c25e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x501D 5312 bytes
font_01_sfnt_off0000621b.bin
777bbc31511e9cd8b72cba0c545b45fdef01c6ff5c7f9efd6c15175c928c92b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x621B 11272 bytes

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