Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16dff0271f473ed…

MALICIOUS

PDF

35.5 KB Created: 2020-04-11 08:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b62529d09d7d5c3f94557e7b2ba626cd SHA-1: 53b130af31e4f4e5f6cfe3b54fd56506a5502ab2 SHA-256: f16dff0271f473ed850fa7a6c4c6edcec9368987a94bc39307b8456ab44d3328
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a large number of external links, many of which point to domains that appear to be part of a link farm. The document body, though heavily obfuscated, contains text related to a 'Saxon math course' test, suggesting a lure to disguise the malicious intent. The primary heuristic indicates a PDF link farm, and the ML classifier strongly suggests maliciousness. The embedded URLs are likely used to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 3

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://iweargreatness.com/uploads/1/3/0/9/130969997/130969997.html#saxon+math+course+3+cumulative+test+6b
    • http://barrysjava.com/uploads/1/3/0/5/130539637/5058416.pdf
    • http://transitplatz-nein.ch/uploads/1/3/0/4/130477252/napokexikijisux.pdf
    • http://redneckhunterstore.com/uploads/1/3/0/9/130969066/956ad.pdf
    • http://downriverkaraokeanddj.com/uploads/1/3/0/4/130488832/7122602.pdf
    • http://stemcellnetworks.com/uploads/1/3/1/4/131438096/meguxaletoson.pdf
    • http://lpindar.com/uploads/1/3/0/6/130620455/5864374.pdf
    • http://kickercontrols.com/uploads/1/3/1/3/131379990/8273446.pdf
    • http://marshallaerolimited.com/uploads/1/3/0/9/130969199/755eeac.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ffa.bin
d3419e405ffb5676e99841c292b5b12550979ebd0832d57713809a6b8ad25b49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FFA 9204 bytes

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