Malicious PDF — malware analysis report

Static analysis result for SHA-256 d539206c3884dd0d…

MALICIOUS

PDF

34.2 KB Created: 2020-06-05 03:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ecc18b8d7ac25529be482cf73cb663b SHA-1: 92dfb234574099be483d677a30131f9fd2caeb00 SHA-256: d539206c3884dd0d9114d47e5a628208c32895dcab8a6e6ad62a04d09bbe3b7e
62 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, predominantly using numeric or generic slugs in the path, suggesting a link farm or SEO manipulation tactic. The document body text, though partially corrupted, includes references to 'Kuta software infinite pre algebra answer key' and the wkhtmltopdf generator, which may serve as lures. The primary intent appears to be directing users to a network of external PDF files, potentially to host malicious content or engage in SEO spam.

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://treasures4yourheart.com/uploads/1/3/1/3/131383333/131383333.html#kuta+software+infinite+pre+algebra+answer+key
    • http://manalokris3d.com/uploads/1/3/0/6/130604179/vuwuv.pdf
    • http://liazonstudio.com/uploads/1/3/1/8/131871993/barimafaj_dorisi_guxipupinuniti.pdf
    • http://bellinghambob.org/uploads/1/3/1/0/131070866/56060cd6e026983.pdf
    • http://annagbrackrambo.com/uploads/1/3/0/3/130313038/dizegasiwu.pdf
    • http://dogparentsaf.com/uploads/1/3/1/4/131438437/e4b63ccd4da831.pdf
    • http://wellfitunionsport.com/uploads/1/3/0/5/130551279/sovibadoti.pdf
    • http://webdisk.com-unlocked-valid-account.com/uploads/1/3/0/7/130739560/0721fe28.pdf
    • http://sghwoodturning.com/uploads/1/3/0/7/130776358/vuxajegamiv.pdf
    • http://frontporchfarms.org/uploads/1/3/1/4/131483197/sofabekab_nilemetusareke.pdf
    • http://treasures4yourheart.com/uploads/1/3/1/3/131383333/terms.html
    • http://treasures4yourheart.com/uploads/1/3/1/3/131383333/dmca.html
    • http://treasures4yourheart.com/uploads/1/3/1/3/131383333/policy.html
    • https://gakirebeb.files.wordpress.com/2020/06/37274845519.pdf
    • https://juwojoxado89904707.files.wordpress.com/2020/06/sediso.pdf
    • https://pubivise.files.wordpress.com/2020/06/bexoxolasutu.pdf
    • https://ratuwig.files.wordpress.com/2020/06/42600326224.pdf
    • https://nufufarow.files.wordpress.com/2020/06/18435890982.pdf
    • https://xapoteronov.files.wordpress.com/2020/06/kotejuzanokem.pdf
    • https://rilasam.files.wordpress.com/2020/06/firujufosez.pdf
    • https://nobasukilox.files.wordpress.com/2020/06/50423089550.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_off00005bab.bin
d1aedaee5ce7e709fa9706acc2306df99023a6c1dfd5d720e5654f02b491339f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BAB 9516 bytes

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