Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e7f3042cf5fbf2…

MALICIOUS

PDF

33.8 KB Created: 2020-06-15 19:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50326493b245a35b92443f6bceacb97d SHA-1: f05a31590d7ec0662ae6179fcd407ab7df6d909e SHA-256: 50e7f3042cf5fbf2f7e3bb00830b1d7605b101540f725ce67a56e1296134d7e5
62 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains. The document body text, though garbled, includes the phrase 'Teaching english to kids worksheets' and the URLs themselves often contain numeric or descriptive slugs, suggesting a link farm or SEO poisoning tactic. The primary heuristic 'PDF_SEO_LINK_FARM' confirms this, indicating the PDF is designed to host numerous external links. The presence of these links suggests the document is a lure to redirect users to potentially malicious content hosted on these external sites.

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://autodiscover.redhands.nl/uploads/1/3/0/6/130639272/130639272.html#teaching+english+to+kids+worksheets
    • http://mymaidenvoyage.com/uploads/1/3/0/2/130289592/8fa7f86e.pdf
    • http://charmainecole.net/uploads/1/3/1/0/131070520/nevuwesudusina_pifuvamobij.pdf
    • http://reflexiondeporteupvehu.com/uploads/1/3/1/0/131070009/pijuvo_mubalixut.pdf
    • http://beautifulphenomenon.com/uploads/1/3/1/8/131856214/8b779.pdf
    • http://twincitieselectricmn.com/uploads/1/3/1/8/131871871/5277934.pdf
    • http://locsmithnaturalhairlounge.com/uploads/1/3/0/7/130775396/d9f7db91397bc.pdf
    • http://mancinos.net/uploads/1/3/0/2/130271142/37a593.pdf
    • http://smileyfacetv.com/uploads/1/3/1/6/131636612/3a7b2cd9371dc2.pdf
    • http://mail.enotecaathena.com/uploads/1/3/0/5/130551050/neguza-vadogefuradopix.pdf
    • http://mail.etepam.gr/uploads/1/3/1/8/131856131/gunawegunuk.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_off000059d8.bin
0162328ea72b9a4c3058618d1206aa4830fa3f7bba2fa97d835ca74d1fbc21a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59D8 10248 bytes

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