Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90a7f0ed126a06a…

MALICIOUS

PDF

33.7 KB Created: 2020-09-01 15:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc11dced2c4d0954f0c6df22725170cd SHA-1: d7eb498d2a7641c281b985d3787ca86b2ba0eab7 SHA-256: a90a7f0ed126a06ae3b1969038d9284c23a4e51482f0641a596c0964f19ae7b1
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.link, which is disguised as educational content. The document body, though heavily obfuscated, contains the same URL and appears to be a lure for educational materials. The presence of a PDF link farm further suggests an attempt to distribute malicious content through SEO poisoning tactics.

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.link/pify?keyword=finding+percentages+word+problems+worksheets
    • https://static.usrfiles.com/ugd/b8c837_de81def0044f4711a94fb8dd501c1da2.pdf
    • https://static.usrfiles.com/ugd/f09a9d_34263d7cc6ed480fa24583b830b1933d.pdf
    • https://static.usrfiles.com/ugd/4bb894_f9092fc1ed96498e88116c31652e0160.pdf
    • https://static.usrfiles.com/ugd/0c4177_5a47104b5de041c2855a98cdcffdb6f5.pdf
    • https://static.usrfiles.com/ugd/565485_fe378fc7580f4a8a9ba96cefd02b4d31.pdf
    • https://static.usrfiles.com/ugd/dc98cc_2f447eafeeec4fe8ba34e0c308d80821.pdf
    • https://static.usrfiles.com/ugd/0b46e6_54f7b18148104679b1582d9da72646a9.pdf
    • https://static.usrfiles.com/ugd/db1da1_870f2c850fc74228ad2aa8efaf2080ff.pdf
    • https://static.usrfiles.com/ugd/c836c3_7aa8de2e21804711910e76229497421e.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_off000044ee.bin
dd8f6c3523f2a9c351b32e0a8e75f3923dcaa4771262fcb2e9b74d9f042c3bb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x44EE 5736 bytes
font_01_sfnt_off00005856.bin
0d50ff98277b6fca036d9d61b827ac740daf9b0fdf0ad03003063e17c5f6ef68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5856 9884 bytes

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