Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87ef50abb4ab9d7…

MALICIOUS

PDF

39.7 KB Created: 2020-08-30 10:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1578f3eb9eb3ea9743b10c2819890dd SHA-1: e84bc4c17e9afa79105e086ded926b352efdf9a7 SHA-256: b87ef50abb4ab9d700d4ba8a380d236ef268bc241bc28ea7951bd40f12e56502
150 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as legitimate PDF downloads, but one of the primary links redirects to known malicious infrastructure. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for 'Oracle sql by example pdf'. The ML classifier strongly supports the malicious nature of this PDF.

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=oracle+sql+by+example+pdf
    • https://static.usrfiles.com/ugd/b8c837_06a290a14c7b4918819c938994945933.pdf
    • https://static.usrfiles.com/ugd/dd4472_2c68794508e04e5183d0f8b3199ef788.pdf
    • https://static.usrfiles.com/ugd/b8c837_2cdd7914f6664c0fb4f3b3874868d185.pdf
    • https://cdn.shopify.com/s/files/1/0452/0201/4357/files/xilokatiketobanivepagut.pdf
    • https://cdn.shopify.com/s/files/1/0439/5322/5883/files/wikeno.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_38225eb126a442ddb379947e677e24b3.pdf
    • https://static.usrfiles.com/ugd/b8c837_d7807bcadfb849dea0642997cd7616ff.pdf
    • https://static.usrfiles.com/ugd/b8c837_99708c189bd14f61846832929278c864.pdf
    • https://static.usrfiles.com/ugd/b8c837_81a1a1ea9071436fa46061a6bd567d35.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c75d12bd18d45daaf7b6b814430cbda.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a9295d27e8b4944bd187d4ef9afdfad.pdf
    • https://static.usrfiles.com/ugd/a2e20a_667adc9bf6af4da1a6d5678b948539ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_21485fa6f9214a2188425a7cfd558307.pdf
    • https://static.usrfiles.com/ugd/48d9a1_b165d7a3470c4a67b222dc736cea2f12.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_off00005be9.bin
e1c41c74fd93c598df058cfa73f3c6852f037ba6805461cd8e3b01972d6256e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BE9 5764 bytes
font_01_sfnt_off00006f6f.bin
406738028f732aa39d64236bb16870b476757638312fe151b115b1daa13b68af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6F 10228 bytes

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