Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cd076f01f5f219d…

MALICIOUS

PDF

43.6 KB Created: 2020-03-11 12:31:38 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bf0e592b65894e6bbc4e8bb692fd8835 SHA-1: 4ff91a4476b2fcbe6429c5f67226261a631a76b1 SHA-256: 7cd076f01f5f219d319d338b0fbc8c693a051ed24817455c38c7aedaaf7efc5b
92 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are SEO-optimized and point to other PDF files. This indicates a link farm strategy designed to attract users searching for specific content, such as programming exercises. The primary URL embedded in the document body, 'http://txt51.slpny.com/uploads/1/3/0/7/130776539/130776539.html#core+java+programming+exercises+with+solutions+pdf', reinforces this lure. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a malicious distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://txt51.slpny.com/uploads/1/3/0/7/130776539/130776539.html#core+java+programming+exercises+with+solutions+pdf
    • http://darearcade.com/uploads/1/3/0/6/130620280/dixisenolovud-vadakonusonum-nixog-fagatu.pdf
    • http://mta-sts.mail.beroepskeuzetest.biz/uploads/1/3/0/7/130738504/c51a684.pdf
    • http://my-honey-badger.com/uploads/1/3/0/5/130543351/26dc90.pdf
    • http://phaseiicoaching.net/uploads/1/3/0/5/130543166/6240668.pdf
    • http://commissionedscp.org/uploads/1/3/0/7/130775241/8484216.pdf
    • http://castleinnriverside.com/uploads/1/3/0/9/130969301/0286cd899b4bb9e.pdf
    • http://southnewtoncommunity.com/uploads/1/3/0/6/130603810/banusoguke.pdf
    • http://www.jordanfirstly.com/uploads/1/3/0/2/130270958/838a7a1ef0c6e1.pdf
    • http://wecanimpressyou.com/uploads/1/3/0/7/130776040/jexiwetimuxo.pdf
    • http://rampantgames.net/uploads/1/3/0/5/130550834/4607495.pdf
    • http://michelledgregory.com/uploads/1/3/0/8/130813922/lutonixine-vorosanarejufen-labikoba-donupezigu.pdf
    • http://www.britishmountainacademy.com/uploads/1/3/0/5/130544147/74df1c11f5e54d.pdf
    • http://www.worldofvibes.com/uploads/1/3/0/6/130604911/672b1ab7bd.pdf
    • http://74-123-76-247.mgwnet.com/uploads/1/3/0/7/130776322/eee206e4822.pdf
    • http://saloteflorist.com/uploads/1/3/0/6/130605341/2a72379e2891e.pdf
    • http://minimalteacher.com/uploads/1/3/0/2/130289800/70aa0bb88961b.pdf
    • http://arizonadisinsect.com/uploads/1/3/0/5/130541023/325c63adbc9ef.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_off00007f63.bin
5df22a7347e8152824bd4cc7e4b0237c66e67afea9ad362fbfdfce7e8380cea7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F63 8716 bytes

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