Malicious PDF — malware analysis report

Static analysis result for SHA-256 99993cc804d1f717…

MALICIOUS

PDF

80.7 KB Created: 2020-08-14 06:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7db73df3c950c94af0b839d1a9600679 SHA-1: 0cf2aa50baa29c0f0a747f7c85c027ee2e64c7e2 SHA-256: 99993cc804d1f71721c9ff7a5d4fb1ab80b816fdd127d884d0b444366a057e1a
120 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, pointing to 'https://ttraff.cc/pify?keyword=gerund+and+participle+phrases+worksheet'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to external PDFs hosted on domains like cdn.shopify.com. The document body, though partially corrupted, contains the target URL, suggesting a social engineering lure disguised as an educational worksheet.

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=gerund+and+participle+phrases+worksheet
    • http://files.recollectiveway.org/uploads/1/3/1/4/131408017/f723b92a39858d2.pdf
    • http://sovuj.fastflyingmarketing.org/uploads/1/3/0/8/130874277/laxebozisipor.pdf
    • http://files.dreamcatchers.travel/uploads/1/3/0/8/130814535/kitejigokubinovovok.pdf
    • http://sokanudax.shopvinocellars.com/uploads/1/3/2/7/132740405/xudad_kekago.pdf
    • http://files.bevinlin.com/uploads/1/3/1/3/131379183/1d2950ec254875.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9074/files/65737028176.pdf
    • https://cdn.shopify.com/s/files/1/0435/1387/2548/files/tanit.pdf
    • https://cdn.shopify.com/s/files/1/0433/4249/5895/files/nagasigejo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pufabupenidobuxix.pdf
    • https://cdn.shopify.com/s/files/1/0431/8189/9936/files/aprendizaje_activo_libro.pdf
    • https://cdn.shopify.com/s/files/1/0429/6635/2025/files/5148397784.pdf
    • https://cdn.shopify.com/s/files/1/0433/5930/5877/files/46667337613.pdf
    • https://cdn.shopify.com/s/files/1/0427/5588/3175/files/wagaxameluvijaraxe.pdf
    • https://cdn.shopify.com/s/files/1/0431/1698/6534/files/bleach_brave_souls_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0428/8898/6787/files/the_lonely_shepherd_guitar.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_off0001003c.bin
a8205f0fe3a68e276a8197dc0266180f9a2e147db70fbd1c68c29a8599f22cbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1003C 5348 bytes
font_01_sfnt_off00011276.bin
1d3083fcc7a50ddeda5fc566e656bbde04d1f7ce2921b03321a2e2bd08c194ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11276 10304 bytes

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