Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b63b363e83c4ac…

MALICIOUS

PDF

42.8 KB Created: 2020-08-31 03:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abe6256d152c7368c8067eab9ce43dd6 SHA-1: da9d6bd6a965bf99402ea539a220fe94f6379cd6 SHA-256: 82b63b363e83c4ac16a33680fed15482cfa89360a073f0b6427e163bdf74bc93
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The embedded URL points to a known malicious redirector, which is likely designed to lead users to a malicious website. The document body, though heavily obfuscated, contains the same URL, reinforcing its malicious intent. No scripts were extracted from this sample.

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.com/wix?keyword=sto+interphasic+instability
    • https://static.usrfiles.com/ugd/a91264_d1ad15e248a54d738ef504460b64c235.pdf
    • https://static.usrfiles.com/ugd/b8c837_e6b032325d904897bf9cf1e87d7ac8a1.pdf
    • https://static.usrfiles.com/ugd/a467d2_8519fcb849024a829a5e235a989fd4a4.pdf
    • https://static.usrfiles.com/ugd/b8c837_92d19a79efe345d0bc8ffa3f4fb0913e.pdf
    • https://static.usrfiles.com/ugd/b8c837_20e39a787be1497a9b1ff2e3c267bea5.pdf
    • https://static.usrfiles.com/ugd/735424_18c28a6fa07140dab07059dfc758c7f1.pdf
    • https://static.usrfiles.com/ugd/b8c837_58492f66ab424fb8bc72b81a71a7c012.pdf
    • https://static.usrfiles.com/ugd/7baf93_99b460eaa9e0430486e18e18cbd2bebe.pdf
    • https://static.usrfiles.com/ugd/b58d21_a9da92489108481cb6f79705169acee9.pdf
    • https://static.usrfiles.com/ugd/b7082a_e358129d77b841a29f59f9944404bf45.pdf
    • https://static.usrfiles.com/ugd/b8c837_c08fcbbed20741a2b12fb4785c554676.pdf
    • https://static.usrfiles.com/ugd/0c268c_9b4ea723c6e04a76b1250111b4f902d2.pdf
    • https://static.usrfiles.com/ugd/0e2875_5ca85037157045df8108bdc1150ae418.pdf
    • https://cdn.shopify.com/s/files/1/0439/1672/2331/files/fileguziboge.pdf
    • https://cdn.shopify.com/s/files/1/0436/1306/1277/files/dilobasalo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7985/0398/files/26952327799.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_off00006b13.bin
352803e1e2d0544845cf1ba66d453392f815cd5e4ae15da32b290eb3124b4d77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B13 5364 bytes
font_01_sfnt_off00007d3f.bin
92e65e44ac46a02c54b8b634064f4c0c6ba6f2052eda82edccba05f109a74e03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D3F 9816 bytes

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