Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6ef4a1b42a19530…

MALICIOUS

PDF

40.6 KB Created: 2020-08-15 02:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b7d6e5a05031ee6bea44bd08aa08668 SHA-1: 2d0dfef0bd8f973d170496fd5929137f69ffb207 SHA-256: a6ef4a1b42a195304bd91320f686633d3720706e7f3cfd31cedc9be6d01dd2fb
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though partially corrupted, contains text suggesting it is a 'Pythagoras theorem pdf worksheet', likely a lure to entice users to click the malicious link. The primary malicious IOC is the redirector URL, which is designed to lead users to further malicious content.

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/wb?keyword=pythagoras%20theorem%20pdf%20worksheet
    • http://files.jachinboaztri.com/uploads/1/3/0/8/130873804/nunavetevum-ralimo-lizisatitomute-zikadonumug.pdf
    • https://cdn.shopify.com/s/files/1/0429/3174/9031/files/84831813477.pdf
    • https://cdn.shopify.com/s/files/1/0434/1596/1762/files/sogadew.pdf
    • https://cdn.shopify.com/s/files/1/0431/5955/2155/files/vesonijerofulodosuleledow.pdf
    • https://cdn.shopify.com/s/files/1/0440/8036/5720/files/38246583142.pdf
    • https://cdn.shopify.com/s/files/1/0441/0625/2440/files/flip_for_mac.pdf
    • https://cdn.shopify.com/s/files/1/0433/0350/1989/files/fiwejigonikokenoriz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0802/3966/files/ba_first_year_english_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/7243/8947/files/gewiwaroluli.pdf
    • https://cdn.shopify.com/s/files/1/0437/7837/5829/files/65769086965.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_off00006019.bin
cb30a3bd3508e790890279abe551bb6cf37476668fee3eea7fabbe5a9bc6a84b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6019 5684 bytes
font_01_sfnt_off00007368.bin
1fd752a54a4165e9fa165d0febe81456af0b59202bfe4c44a71547e3f89e9aae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7368 10052 bytes

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