Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7e2177437b3663…

MALICIOUS

PDF

48.8 KB Created: 2020-09-12 20:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb61e1496eacd1bc4027965151d8669b SHA-1: 8de707196674244a2776337b52518972d046d668 SHA-256: ef7e2177437b3663117197ee438eb22f8346df0c730e98a9b665653727969207
150 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure for an 'earth science regents answer key'. The ML classifier strongly flagged this PDF as malicious. The primary attack vector is likely social engineering via a malicious link embedded within the document.

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.me/pify?keyword=june+2016+earth+science+regents+answer+key
    • http://files.warrenmottboosters.com/uploads/1/3/0/8/130814308/1811736.pdf
    • http://files.ptutoysandmore.net/uploads/1/3/1/6/131637014/6143398.pdf
    • http://files.wrightseaplanebaseinc.org/uploads/1/3/0/7/130739835/gatip.pdf
    • http://zesibobo.drcarolineclarke.com/uploads/1/3/1/8/131857334/a39dc3f1.pdf
    • https://cdn.shopify.com/s/files/1/0435/0240/3750/files/whirlpool_dishwasher_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/1308/7142/files/greenhouse_monitoring_and_control_system_project_report.pdf
    • https://cdn.shopify.com/s/files/1/0435/3795/7023/files/fevatis.pdf
    • https://cdn.shopify.com/s/files/1/0435/6872/6171/files/sisopibod.pdf
    • https://static.usrfiles.com/ugd/2d1648_4cc0854e2fa04688a38adcf972c1fda4.pdf
    • https://static.usrfiles.com/ugd/b8c837_a081cd24809f4b428fd79204165641de.pdf
    • https://static.usrfiles.com/ugd/b8c837_bfb518c5d59a49098f26597b10d0cccc.pdf
    • https://static.usrfiles.com/ugd/6e13d9_0e3a1458e57a412e9567e603831dc98a.pdf
    • https://static.usrfiles.com/ugd/3bca44_1d187cfa7bcd445bbff97f593306ae67.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006015.bin
40b62e1ffe5f5a137a7b29610568ddc24bf03aa1a1d4dcc77514bca6919f748c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6015 5756 bytes
font_01_sfnt_off000073cc.bin
0fde41e215b8d250d7f6c5772720442049d0290699e2e4463b855bcc7f891a56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73CC 14648 bytes
font_02_sfnt_off0000a112.bin
f0a8b786da721c7415a59d91fbce3b20bbb98ea32e48857ac1ff22d53b00ec29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA112 16144 bytes

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