Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccbed56a4c2f949a…

MALICIOUS

PDF

40.1 KB Created: 2020-04-23 12:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a4a9ef1a508ce7c329fae2aeed62f892 SHA-1: a536d67c6eb2cb8ac01b287760146f8658d042fd SHA-256: ccbed56a4c2f949a34094a3d349a9403ba01e2d14a4ed00ca9d3288c1991f236
92 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to similarly structured URLs on different domains, indicative of a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to 'Counterweight guide shoes' and the wkhtmltopdf application, suggesting a potential lure or disguise for the malicious linking activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://easyfreelegal.com/uploads/1/3/0/5/130590589/130590589.html#counterweight+guide+shoes
    • http://show2web.com/uploads/1/3/1/4/131438316/c59ed3f804b.pdf
    • http://jmaisd.org/uploads/1/3/0/8/130813428/8065438.pdf
    • http://step11workshops.com/uploads/1/3/0/5/130551558/niwuxa_kipifuvizaje_gadakufawalotot_lariri.pdf
    • http://athl33t.org/uploads/1/3/0/7/130740393/f51440e3a1.pdf
    • http://russellchapelontheolivegrove.com/uploads/1/3/1/4/131455416/fenenujokox_lopof.pdf
    • http://athl33t.org/uploads/1/3/0/7/130740393/f51440e3
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d66.bin
0dd1de3dc07e3918b33ce0d0e73474a6454c0152119f65753170302e88032933		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D66 8388 bytes
font_01_sfnt_off00007de1.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DE1 2652 bytes
font_02_sfnt_off0000871f.bin
eaa4dde51fd04d4db8dc223d97e5e1aeb2070941b7c144db1acc557f645d9ab7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x871F 4184 bytes

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