Malicious PDF — malware analysis report

Static analysis result for SHA-256 26e9e8d37b135806…

MALICIOUS

PDF

54.8 KB Created: 2020-08-30 12:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bf5c38583e1b4ea89ffa1817ec73b7b SHA-1: a5179cc60425fb6078c7a2c52f110e1f7d183c25 SHA-256: 26e9e8d37b135806ec6dc3ced3a1e541cc541a6151ed47f14b2663ce31dced8d
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, specifically pointing to 'https://ttraff.ru/wix?keyword=planeacion+educativa+chiapas'. This URL is likely used to redirect the user to a malicious site. The document also contains a PDF link farm heuristic, indicating a large number of external links, many of which point to the same domain, suggesting a spam or SEO abuse tactic. The ML classifier also strongly flagged this PDF as malicious.

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.ru/wix?keyword=planeacion+educativa+chiapas
    • https://static.usrfiles.com/ugd/510a18_604102487cc349078a9c7de476940b32.pdf
    • https://static.usrfiles.com/ugd/b8c837_6a7f1cb66f4347cf9df3c1238c4691dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_933bf5f93a564e5d826650df50e82b30.pdf
    • https://cdn.shopify.com/s/files/1/0432/7440/3996/files/31971916789.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9538/files/kiserujuviwemukavufenipu.pdf
    • https://static.usrfiles.com/ugd/2ac701_598606a163e4439bb2bc2cf380a2c20d.pdf
    • https://static.usrfiles.com/ugd/b8c837_8c4eed335fd642a4af7c3d861c14881c.pdf
    • https://static.usrfiles.com/ugd/bfbc46_1bd596fd1ea949ebbcb3d685b8b4027c.pdf
    • https://static.usrfiles.com/ugd/0aab01_bb5a0464a98c451295dc4f23fa8e670d.pdf
    • https://static.usrfiles.com/ugd/b8c837_62a70bef59b54f0592c899bfcb29f045.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008b62.bin
29fe875a38e914fffb0f92468f6a07471b325e12ab4bbfcfe39f78c7445cdf59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B62 5008 bytes
font_01_sfnt_off00009c5c.bin
a538f02d82c0d91a421d8dba92c0ed985eaef98bbf7937b9c9865f9b23842076		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C5C 10728 bytes
font_02_sfnt_off0000bf50.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF50 4324 bytes

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