Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f292017d08ef523…

MALICIOUS

PDF

40.9 KB Created: 2020-08-05 22:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05593d213b3a9ba4d3e575db85eb9148 SHA-1: ba4264e2fe06fa5b714dc62ecc8dccbdb4835325 SHA-256: 8f292017d08ef523cb84c8ddf05edd95ed81f415e4a60e8254f8a7b6cb80726a
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/wb?keyword=sample%20solicitation%20letter%20for%20donations%20pdf'. This indicates a social engineering attempt to trick the user into visiting a malicious site. The document body, though heavily obfuscated, also contains this URL and numerous other links, many hosted on Shopify, suggesting a link farm for SEO poisoning or redirection. The ML classifier strongly supports the malicious nature of this PDF.

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/wb?keyword=sample%20solicitation%20letter%20for%20donations%20pdf
    • http://files.lovehealthyme.com/uploads/1/3/1/0/131070894/bbfc027a3d.pdf
    • http://files.wencinja.com/uploads/1/3/0/7/130776246/vanivufigede-xexolewukun.pdf
    • http://fumodu.bronwen-jones.com/uploads/1/3/1/4/131438137/jebogil.pdf
    • http://begon.communitycreditrepair.org/uploads/1/3/2/7/132710780/jisarafod.pdf
    • https://cdn.shopify.com/s/files/1/0437/5543/8234/files/75954821192.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/2013_chrysler_200_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/5981/4306/files/alerting_services_in_library.pdf
    • https://cdn.shopify.com/s/files/1/0440/7102/6853/files/apple_mobile_device_support_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/8702/6590/files/force_checkout_git.pdf
    • https://cdn.shopify.com/s/files/1/0431/5742/2240/files/notepujowapowezuvusapiv.pdf
    • https://cdn.shopify.com/s/files/1/0440/1732/0094/files/attendance_sheet_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/4925/5061/files/12279222335.pdf
    • https://cdn.shopify.com/s/files/1/0432/7656/6684/files/57483663574.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejupabofutub.pdf
    • https://cdn.shopify.com/s/files/1/0431/8255/5297/files/mavaxusefeb.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_off000062c8.bin
037f8e30e6bde297d35a444a0737c2277517b5d39ebec5543ae883ee9a356a47
pdf-font-stream PDF embedded font (sfnt) at offset 0x62C8 5404 bytes
font_01_sfnt_off00007510.bin
f5283b392ca7d095a86c8ccf62244546d2aa87985e9ccc067131219d81ecbdc7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7510 9868 bytes