Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdfbb3c908a20f1a…

MALICIOUS

PDF

85.9 KB Created: 2020-07-07 12:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1b89609b4b57609ff189290ec981e57 SHA-1: e2ad8effd67777db3db9d4a1e34ecd50dbe0b053 SHA-256: cdfbb3c908a20f1a2e872057648fc712d977ec43e9d06b6721396864b91a90d0
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains that appear to be part of a link farm. One prominent link redirects to a malicious URL, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated 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.com/wb?keyword=occupational%20stress%20scale%20questionnaire%20pdf#occupational+stress+scale+questionnaire+pdf
    • http://files.jackblairgray.com/uploads/1/3/1/3/131384018/eede518175.pdf
    • http://files.dnaleatherwa.com/uploads/1/3/0/7/130738814/8327209.pdf
    • http://files.ethelbustamante.net/uploads/1/3/1/4/131406356/7012749.pdf
    • http://files.spinecarechiropractic.net/uploads/1/3/1/3/131384018/30437.pdf
    • http://files.sweetbabiesdayhome.com/uploads/1/3/2/7/132740320/zipud_wenuv_soraminudej.pdf
    • http://files.bingocompany.net/uploads/1/3/1/3/131379612/d2857f2095895b.pdf
    • http://files.ashleyparsonsyoga.com/uploads/1/3/2/7/132740415/newixebomufobezofawe.pdf
    • http://files.ikargb.co.uk/uploads/1/3/1/4/131409170/c416f2d8c877.pdf
    • http://files.sjuartdesign.com/uploads/1/3/1/6/131606087/wulixakitanajukaf.pdf
    • http://files.companionsofchrist.org/uploads/1/3/0/9/130969375/3234800.pdf
    • http://files.thedinopark.com/uploads/1/3/2/7/132740415/6535022.pdf
    • http://files.jackblairgray.com/uploads/1/3/1/3/131384018/eed
    • https://xipewatataz458399044.files.wordpress.com/2020/06/69074772248.pdf
    • https://luwaliwev220981188.files.wordpress.com/2020/06/volojozalizixaw.pdf
    • https://lirapirabemo.files.wordpress.com/2020/07/62662335202.pdf
    • https://xeneguruxidi.files.wordpress.com/2020/06/30624081562.pdf
    • https://jarumob.files.wordpress.com/2020/07/pidujafepojutegitip.pdf
    • https://defawepunago322067097.files.wordpress.com/2020/07/sopukixepe.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_off00010670.bin
7e449c4938f65bdbc8b075ceb378f31be77f1e2f625331fd84b61723eb63bc1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10670 5184 bytes
font_01_sfnt_off00011812.bin
1287096dfd6a21dcf830029026a55c2b879c4e72292692daf86f518e990b88b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11812 16280 bytes

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