Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cbc04426c813947…

MALICIOUS

PDF

65.5 KB Created: 2020-08-20 23:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf14c5c733d666b1e20efe48ecb5ece8 SHA-1: 4d3b70c1fee1d625178a80d84bb16535042418b6 SHA-256: 8cbc04426c8139470c31462ed5db68e82c8f60d94f34977d21fbb923295fcd27
150 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the redirector link. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=green+check+mark+symbol
    • http://mikejinek.picardlab.org/uploads/1/3/0/8/130814017/butove_xojekozem_lipazow.pdf
    • http://files.georgeswalkies.co.uk/uploads/1/3/2/8/132814375/7906102.pdf
    • https://cdn.shopify.com/s/files/1/0432/8269/4312/files/butud.pdf
    • https://cdn.shopify.com/s/files/1/0431/0922/0501/files/59790935283.pdf
    • https://cdn.shopify.com/s/files/1/0431/6967/7474/files/mythical_man_month.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78108387577.pdf
    • https://cdn.shopify.com/s/files/1/0429/2699/7663/files/lajipe.pdf
    • https://cdn.shopify.com/s/files/1/0438/0501/6226/files/ar_desai_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71409998288.pdf
    • https://cdn.shopify.com/s/files/1/0428/6113/3990/files/unity_2020_augmented_reality_projects_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/0255/2742/files/90031144028.pdf
    • https://cdn.shopify.com/s/files/1/0429/5337/5897/files/taref.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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062ac.bin
cfb04f436a106ad6b8d4b91085064b0b7d0dbd38f79e1a87f750cf3bccbf63a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62AC 6904 bytes
font_01_sfnt_off000073fd.bin
5acf0efd566ba5deff16895905dadfa1d17a47a3326fdd8d2447592865001c17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73FD 3192 bytes
font_02_sfnt_off00007f6d.bin
4731656638e10fcedc650472a0bc1b5faf6252c7ec2f0dc5bb40318b2f48b69f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F6D 5376 bytes
font_03_sfnt_off00009184.bin
ba883e7e2cc35b76a5f1e33b465bc0f52d2461537d071cb28071e8dbe1df0265		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9184 6476 bytes
font_04_sfnt_off0000a863.bin
e0308bb373e947deb879b1b88079c2a1b701e4bf80b9cf77f0e7537f809ddd82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA863 15104 bytes
font_05_sfnt_off0000d7c7.bin
5bfc0d476caaedb762628f1cd87708d094ec6afa4e1a6e9f5436a9e989a4a50f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C7 18772 bytes

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