Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8f15a0845be04c…

MALICIOUS

PDF

43.8 KB Created: 2020-08-06 22:39:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1378885feefbfcc8d1b0c1647cd6321 SHA-1: 76c10d383965b26d2d44cc9d0d6bbf6f8fd4897a SHA-256: ed8f15a0845be04cf574e1c3aeade34035638fe7cf46974c1683b69e31e6cdcc
150 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One of these links, https://ttraff.cc/pify?keyword=example+of+mean+median+mode+in+statistics+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to statistics and the PDF filename, suggesting a lure to disguise the malicious intent. The ML classifier strongly indicates maliciousness.

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=example+of+mean+median+mode+in+statistics+pdf
    • http://files.sunshinejeremiahwolfe.com/uploads/1/3/1/4/131438313/5935579.pdf
    • http://files.isautah.com/uploads/1/3/1/3/131379406/fe915.pdf
    • http://files.carolinevandeneynden.com/uploads/1/3/2/6/132681443/b1449a3c8.pdf
    • http://files.sunninghill.com.au/uploads/1/3/1/1/131164573/53d41.pdf
    • https://cdn.shopify.com/s/files/1/0435/2009/8472/files/41009540562.pdf
    • https://cdn.shopify.com/s/files/1/0427/8566/9279/files/makazis.pdf
    • https://cdn.shopify.com/s/files/1/0429/2725/9811/files/26544203868.pdf
    • https://cdn.shopify.com/s/files/1/0435/0381/2773/files/go_launcher_3d.pdf
    • https://cdn.shopify.com/s/files/1/0433/0101/1614/files/rudapigaju.pdf
    • https://cdn.shopify.com/s/files/1/0431/5296/5792/files/melavatani.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nepel.pdf
    • https://cdn.shopify.com/s/files/1/0437/9102/4280/files/c_binary_search.pdf
    • https://cdn.shopify.com/s/files/1/0430/8670/8893/files/elementary_grammar_games.pdf
    • https://cdn.shopify.com/s/files/1/0431/1498/7669/files/zitibikonuguxozaz.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_off00006ad1.bin
ea2f9b5381aa1625e65e1f6be801356d11bd406fc89aa3b938bc799d338893b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD1 5228 bytes
font_01_sfnt_off00007c9a.bin
cdf3c4aefc37c3aa29c16ed24a66e14135ae94849b309f0671067fee9b5197fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C9A 11120 bytes

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