Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd61b055ab43c4eb…

MALICIOUS

PDF

39.0 KB Created: 2020-08-23 08:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f7b47f9a666a9888e95ed08ba7a12c8 SHA-1: eb05021027399b41c49b69a356d914a7ee647ddc SHA-256: cd61b055ab43c4eb3faa134e0d63cc639521ead15d95a798397e0ff5f63df00e
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=3+digit+division+worksheets+without+remainders', is designed to redirect users to malicious infrastructure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on cdn.shopify.com, likely to improve search engine ranking for deceptive content. 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=3+digit+division+worksheets+without+remainders
    • http://files.dpdesq.com/uploads/1/3/0/7/130739780/afe3c45989a3ea1.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/bavug.pdf
    • https://cdn.shopify.com/s/files/1/0434/0177/3212/files/vowidazitene.pdf
    • https://cdn.shopify.com/s/files/1/0437/5874/7800/files/arithmetic_reasoning_practice_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/8176/8864/files/xorofuwidafasasuzirob.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/15138334831.pdf
    • https://cdn.shopify.com/s/files/1/0437/4613/2129/files/73086035030.pdf
    • https://cdn.shopify.com/s/files/1/0431/0522/2822/files/zasukezikis.pdf
    • https://cdn.shopify.com/s/files/1/0440/5392/1957/files/78086355894.pdf
    • https://cdn.shopify.com/s/files/1/0434/8762/5369/files/canon_photography_tutorials.pdf
    • https://cdn.shopify.com/s/files/1/0431/6689/2191/files/25778779884.pdf
    • https://cdn.shopify.com/s/files/1/0431/6191/1460/files/59734281710.pdf
    • https://cdn.shopify.com/s/files/1/0432/8875/6384/files/nenejilifugufalebusubamow.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_off00005aeb.bin
5913c5fc670408aeaa028b90e3fa539a86fa545e0b61d4bd0ecee036019967c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AEB 5492 bytes
font_01_sfnt_off00006d79.bin
ce6bd3454e35107bd9d084e4bade63637a6fa71b56550c071455aabcd07c35eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D79 9696 bytes

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