Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca53bb582a67f15a…

MALICIOUS

PDF

39.3 KB Created: 2020-08-29 06:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0b08d5de1ff2b51811cfabeb4d0fd00 SHA-1: e7b47233e7c7c80ea2632d49fc943334d299d4b0 SHA-256: ca53bb582a67f15a8ffe0a2d9cb4be74c3d1486576f297447e1af42e8ea60d03
150 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to a known malicious redirector. The document body, though heavily obfuscated, contains the same redirector URL. The presence of numerous other links to benign-looking PDFs hosted on Shopify suggests a link farm or SEO poisoning technique to obscure the malicious redirector.

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=mickey+meets+the+giant
    • https://static.usrfiles.com/ugd/b8c837_032545bc579f4844a2adcab88841ae67.pdf
    • https://static.usrfiles.com/ugd/b8c837_acdbb6ff422f4e5e854f4982dd587dd7.pdf
    • https://static.usrfiles.com/ugd/b8c837_d1e4da36dce141feb0eaf4e5a9f6c9eb.pdf
    • https://static.usrfiles.com/ugd/b8c837_04df39916c0448b7893174574e4d757d.pdf
    • https://cdn.shopify.com/s/files/1/0430/0003/7527/files/statistical_process_control_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5804/files/fitawedabajuvuzokaru.pdf
    • https://cdn.shopify.com/s/files/1/0429/4646/1855/files/83496626796.pdf
    • https://cdn.shopify.com/s/files/1/0434/5239/9773/files/lemovaxosinamizoxorida.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lujodegiduwidixerilaji.pdf
    • https://cdn.shopify.com/s/files/1/0437/7041/3207/files/fetefudibupexumizaro.pdf
    • https://cdn.shopify.com/s/files/1/0433/3033/8966/files/financial_peace_university_allocated_spending_plan_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/7586/1656/files/mapa_metro_barcelona.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_off0000500e.bin
bfb1a825bb2abf298da5f071f32baa5bfe31749d85bd9c096c075042b3176a3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x500E 4932 bytes
font_01_sfnt_off000060b5.bin
f232c251e33d2739283251c31be5f14172ea523ab7c5a2083f07e7fa88d641d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60B5 9892 bytes
font_02_sfnt_off000082aa.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82AA 4324 bytes

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