Malicious PDF — malware analysis report

Static analysis result for SHA-256 23dd5d3b96c1880c…

MALICIOUS

PDF

41.5 KB Created: 2020-08-07 13:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 794b59d36a580b1086b9d98e2fab4381 SHA-1: 3f41ee09e0179ce9b781bf2c83e5c41acdd21ff5 SHA-256: 23dd5d3b96c1880c4fa394cbbd10b9cc3d15af97050d3ba2695d25e06e395a85
120 Risk Score

Malware Insights

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

The PDF file contains numerous links, including one pointing to a known malicious redirector at 'https://ttraff.cc/pify?keyword=letter+tracing+worksheets+for+kindergarten+pdf'. The document body, though heavily obfuscated, contains text that appears to be a lure for 'letter tracing worksheets for kindergarten pdf'. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content broadly. The file's purpose is to redirect users to potentially 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.cc/pify?keyword=letter+tracing+worksheets+for+kindergarten+pdf
    • http://files.mathwitheeesinc.com/uploads/1/3/1/4/131483108/1329259.pdf
    • http://files.rockingchairuniversity.com/uploads/1/3/0/7/130775063/e2ab5e687.pdf
    • http://files.dechineselincs.com/uploads/1/3/1/4/131408142/3602035.pdf
    • http://files.westcoastmuddypawz.com/uploads/1/3/2/7/132740361/bc2c7e09f758ffa.pdf
    • https://cdn.shopify.com/s/files/1/0439/4529/6027/files/the_canterbury_tales_translation.pdf
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/podalaledimanuser.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/lepat.pdf
    • https://cdn.shopify.com/s/files/1/0433/5943/6951/files/58228443486.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/25843483079.pdf
    • https://cdn.shopify.com/s/files/1/0428/9842/3967/files/vowobiragaroworimofot.pdf
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/xesulej.pdf
    • https://cdn.shopify.com/s/files/1/0431/9592/4640/files/coordination_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0438/0386/9346/files/60245771477.pdf
    • https://cdn.shopify.com/s/files/1/0436/3347/5737/files/78570705715.pdf
    • https://cdn.shopify.com/s/files/1/0435/1646/1211/files/binelinisozofipokimodof.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_off000062fb.bin
b6e4f2223b911a12e8d2cb515b9ef5f051af907f67e6b3c071a65bb442e866a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62FB 5480 bytes
font_01_sfnt_off000075b4.bin
823ea26f41f6a0f6abcde7d417eb595672e8aeac02fc732d6d257377bf919064		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75B4 10296 bytes

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