Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21ff402e3926963…

MALICIOUS

PDF

33.8 KB Created: 2020-08-26 11:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c03821d1dce5fb20b76f1face193ceb5 SHA-1: 0213a36eed0eae92a2f5d4ff13ae7c0593b75108 SHA-256: a21ff402e392696370cca5897ebb3f172022b29d9ad43ebd9e1a404397694525
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=forces+unit+2+worksheet+2'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL and a link to a Shopify-hosted PDF, suggesting a lure to external malicious content.

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=forces+unit+2+worksheet+2 In PDF document text
    • http://files.brianpatrickotoole.com/uploads/1/3/2/6/132680855/2d2093e384.pdfIn PDF document text
    • http://giwipom.pierceclarkfineart.com/uploads/1/3/1/6/131637016/kerazomalej.pdfIn PDF document text
    • http://sipob.shophhbstore.com/uploads/1/3/2/6/132696398/godexewubiniwe_loviwosipudanu.pdfIn PDF document text
    • http://nujixin.stjohnsuccbrighton.com/uploads/1/3/1/4/131452846/kunijik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5183/5801/files/jofemifatebubeme.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/damegadunuje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0445/2777/9999/files/wazaraxelerapu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dokole.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7877/0076/files/65812898700.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7492/6230/files/cahier_de_vacances_cp_ce1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1631/4277/files/pobor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2043/5112/files/44481245930.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0377/2056/files/broiler_vaccination_program.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004659.bin
582cfb0ed22f4b484604b15f87120f9a22a7e42ad0651c0b3c82f7dca3b1f17e
pdf-font-stream PDF embedded font (sfnt) at offset 0x4659 4888 bytes
font_01_sfnt_off0000570b.bin
925d27ddfa4ef2a9687450bbcc9591b70d284e3335035cc34a0c88a84fa53081
pdf-font-stream PDF embedded font (sfnt) at offset 0x570B 10140 bytes