Malicious PDF — malware analysis report

Static analysis result for SHA-256 544645e34acddc17…

MALICIOUS

PDF

40.0 KB Created: 2020-08-17 12:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 553fd45f8b7f526f09e0af41d6eb4726 SHA-1: 75c1b1d9e3efdee064b21bd54716b63d8e39a0ab SHA-256: 544645e34acddc17a65b1e667a3fda0207ee71e8f9231388fc8fbd82f48c86d8
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=lowest+common+multiple+worksheet+year+6'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy, likely to improve SEO for the malicious redirector. No scripts were extracted from this sample.

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=lowest+common+multiple+worksheet+year+6
    • http://files.right-resources.org.uk/uploads/1/3/1/8/131857679/5956744.pdf
    • http://files.onehopecoc.com/uploads/1/3/2/8/132815298/pixivebulodepef.pdf
    • https://cdn.shopify.com/s/files/1/0432/5136/8104/files/xemixifeludew.pdf
    • https://cdn.shopify.com/s/files/1/0436/9973/2634/files/1821502519.pdf
    • https://cdn.shopify.com/s/files/1/0428/4134/2108/files/57159838216.pdf
    • https://cdn.shopify.com/s/files/1/0431/4261/1095/files/livro_after_5_online.pdf
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/50519826410.pdf
    • https://cdn.shopify.com/s/files/1/0430/8038/4674/files/18382385800.pdf
    • https://cdn.shopify.com/s/files/1/0428/1804/4063/files/veximakabobamosovab.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/evaluating_algebraic_expressions_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/2182/0319/files/89036636168.pdf
    • https://cdn.shopify.com/s/files/1/0436/6349/1222/files/zelix.pdf
    • https://cdn.shopify.com/s/files/1/0430/5115/5618/files/kixazonol.pdf
    • https://cdn.shopify.com/s/files/1/0430/5082/7929/files/xadodelinoguriru.pdf
    • https://cdn.shopify.com/s/files/1/0431/7223/3376/files/vopanukegus.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_off00005e22.bin
0235b6ff55bbe2c032ccd8fffd68fdeea0d0157d6575aa3d4b23b8833343a073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E22 5528 bytes
font_01_sfnt_off000070da.bin
d136ca5dfea29f0c82b6547627d1fddf3ba276d55573b2587736795bfb9c8b86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70DA 10020 bytes

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