Malicious PDF — malware analysis report

Static analysis result for SHA-256 336ea5263ea5f61e…

MALICIOUS

PDF

34.6 KB Created: 2020-07-08 15:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a23aa261e4c08c61b37a451730228d41 SHA-1: 097d026b8c0006ff66ac240fb177e15e33c20f4c SHA-256: 336ea5263ea5f61e55c3cf6e130c620c5f1a6337814e777431a55b5bc7605c46
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded links that point to a redirector URL and a large number of other PDF documents, indicative of a link farm. The ML classifier also flagged this PDF with high confidence. The primary attack pattern involves social engineering, luring the user to click on malicious links disguised as educational content. No scripts were extracted, limiting the analysis of direct payload execution.

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.com/wb?keyword=chemistry%20vsepr%20worksheet%20answers
    • http://files.stmarymagdalenewpg.org/uploads/1/3/1/8/131856531/badifa.pdf
    • http://files.southwickrangers.org/uploads/1/3/1/8/131871762/2fdee0a6f7b3b.pdf
    • http://files.andrewmichaelart.com/uploads/1/3/1/4/131408529/59fa416c9cccb3.pdf
    • http://files.printslinkphila.com/uploads/1/3/1/4/131482892/8978254.pdf
    • http://files.summasportswear.com/uploads/1/3/1/4/131453807/118d8e22a22790b.pdf
    • http://files.estesparkeventscomplex.com/uploads/1/3/0/7/130739383/witeduget.pdf
    • http://files.oshkoshcarpetcleaning.com/uploads/1/3/1/0/131070527/didovatifozuba.pdf
    • https://dutifeja.files.wordpress.com/2020/07/lorek.pdf
    • https://nugakizapu287319484.files.wordpress.com/2020/07/27915259160.pdf
    • https://kaladamovala.files.wordpress.com/2020/06/vagewavidufefidukeze.pdf
    • https://wivutotob.files.wordpress.com/2020/06/winisofobezenesuke.pdf
    • https://fexaliranofa.files.wordpress.com/2020/07/15153497383.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_off00004b92.bin
3b0f763d7385ad055bdfa01b3e44c743055ea94f3c54bee3b359d8cf46b403ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B92 5156 bytes
font_01_sfnt_off00005d06.bin
c694927fc17639aa5d81a15891ea3166dedcd63de95ef01d1e5a3dfcd58b8674		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D06 9540 bytes

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