Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77053f2cf327a69…

MALICIOUS

PDF

41.6 KB Created: 2020-08-18 17:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61574253831bf7f2185360bcfb868835 SHA-1: f0201000dd1b12027d30275b49af4b5dbf4bc014 SHA-256: b77053f2cf327a694cdef0fab331cc36a43e91d77f62d64f6edce9d0235b95b1
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to a URL that appears to be a lure for free worksheets. The document body also contains this URL and numerous other links to PDF files hosted on Shopify, suggesting a link farm or a method to obscure the true malicious destination. The primary malicious IOC is the redirector URL.

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.cc/pify?keyword=present+progressive+worksheets+free
    • http://files.sugarcuppies.com/uploads/1/3/2/7/132710627/bilojivukemuj-bifiwonidi-pifomi-bagudemaked.pdf
    • http://wipom.reading-is-lit.com/uploads/1/3/1/4/131453598/706405.pdf
    • http://files.abstractdreamdesigns.com/uploads/1/3/0/8/130874587/6863633.pdf
    • http://files.thriveflinthills.com/uploads/1/3/1/3/131381363/b1b2ba2.pdf
    • https://cdn.shopify.com/s/files/1/0433/2886/4409/files/xejowuxisiboximoguvadu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5024/6054/files/38447361567.pdf
    • https://cdn.shopify.com/s/files/1/0434/6344/2598/files/xizuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/6790/0061/files/essentials_of_human_anatomy_and_physiology_11th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2095/files/wonobigetetiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/6885/8280/files/95196325889.pdf
    • https://cdn.shopify.com/s/files/1/0437/7421/4306/files/81191015616.pdf
    • https://cdn.shopify.com/s/files/1/0434/5161/3334/files/13058802648.pdf
    • https://cdn.shopify.com/s/files/1/0433/7860/6229/files/niwazesuz.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_off000064ce.bin
c9b97b54962957ab90e8f9c6a808d39caa04d07f2f6f24b1ac1eda905d5ce7b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64CE 5136 bytes
font_01_sfnt_off00007664.bin
47129b8a4f8b6fd1396c9a18a0e296ec4882f22f8cc95cc6ffe060bcec83c9aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7664 10336 bytes

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