Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b52e4780f4c05c…

MALICIOUS

PDF

37.5 KB Created: 2020-08-14 22:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c174296c5885f34a79789945f55563cb SHA-1: 4531b06c771e9c6741d4a518f530f12b31aaf192 SHA-256: e1b52e4780f4c05cf47be40f0e3575eacfd8532c823c1027f1888db1621db48a
90 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wb?keyword=air%20pollution%20due%20to%20industries%20pdf'. This indicates the document's primary purpose is to lure the user into clicking this link, likely leading to a malicious website or further malware download. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, but the presence of the malicious URL is sufficient evidence for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 2

  • 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.
  • 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/wb?keyword=air%20pollution%20due%20to%20industries%20pdf
    • http://xerotakut.billymanggala.com/uploads/1/3/2/8/132816036/23dcef4b.pdf
    • https://cdn.shopify.com/s/files/1/0432/7194/6398/files/miravagaxujuvamop.pdf
    • https://cdn.shopify.com/s/files/1/0430/9532/6887/files/forodagogaragoteg.pdf
    • https://cdn.shopify.com/s/files/1/0440/9117/9160/files/2086633624.pdf
    • https://cdn.shopify.com/s/files/1/0431/8861/7378/files/ziduxaxasibo.pdf
    • https://cdn.shopify.com/s/files/1/0435/9585/8083/files/53164427918.pdf
    • https://cdn.shopify.com/s/files/1/0434/9588/2918/files/kleppner_and_kolenkow.pdf
    • https://cdn.shopify.com/s/files/1/0431/6676/1120/files/javoxuliwifera.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_off000056aa.bin
ebf9135430e47136feff76318762065ba47570050d508a5e84731739072c8bcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56AA 4816 bytes
font_01_sfnt_off00006711.bin
b7049cb4a9f057c353fc33448039e4a8e97b614993e46511f533fe03364b11f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6711 10272 bytes

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