Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cbcd70fee23998e…

MALICIOUS

PDF

39.5 KB Created: 2020-08-12 08:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: adfbf546f5be0ce45398ffb9b1980e2d SHA-1: 4e64c8fc626df6209267c1f7e3c0895df7953bdf SHA-256: 9cbcd70fee23998ee8edfe75d46c6d590ee4c2a87312af83ae16190425d560e4
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, a common tactic for SEO poisoning and redirecting users to malicious sites. The primary malicious link identified is 'https://ttraff.cc/pify?keyword=abacus+level+8+worksheets+pdf', which is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the document's purpose is to trick users into clicking it. 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/pify?keyword=abacus+level+8+worksheets+pdf
    • http://duteje.middleschoolcomputerprojects.org/uploads/1/3/1/3/131379965/3889674.pdf
    • http://files.summerfry.com/uploads/1/3/1/6/131607467/wibijexol.pdf
    • http://kiwipa.janmwagnerfineart.com/uploads/1/3/0/7/130739124/9bfe59b49f6a.pdf
    • http://files.nmwordprocessing.com/uploads/1/3/1/4/131453713/2764709.pdf
    • https://cdn.shopify.com/s/files/1/0444/8894/9927/files/arrhenius_equation.pdf
    • https://cdn.shopify.com/s/files/1/0429/2355/7030/files/gigopozebifevezifomux.pdf
    • https://cdn.shopify.com/s/files/1/0440/5533/0981/files/agroforestry_lecture_notes.pdf
    • https://cdn.shopify.com/s/files/1/0439/5096/4904/files/76263807620.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0743/files/fisetusikagufugov.pdf
    • https://cdn.shopify.com/s/files/1/0435/7708/2019/files/magazine_design_templates.pdf
    • https://cdn.shopify.com/s/files/1/0437/3577/7445/files/65702199862.pdf
    • https://cdn.shopify.com/s/files/1/0433/4387/2150/files/28869662557.pdf
    • https://cdn.shopify.com/s/files/1/0432/3170/7294/files/61423928345.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_off00005afd.bin
1c965c6598eed9862ad80f43bbe334fdcb8aebdcf18c28055eb91d27db82bb34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AFD 5784 bytes
font_01_sfnt_off00006eb2.bin
01082ff9be21125091148f275f81ec0e32969da3d96bde59a4ff59a67bb6e056		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB2 10080 bytes

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