Malicious PDF — malware analysis report

Static analysis result for SHA-256 a394539867acfec6…

MALICIOUS

PDF

35.9 KB Created: 2020-03-17 05:39:59 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bde22e7c250b3b07f0c1f39804d508d0 SHA-1: 0a68a2a395f6f2fd6093542546a7051b1350adec SHA-256: a394539867acfec62c562e0006d364e7337d25abf3af5e151d8b5e362294b59f
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to other PDF files, indicating a link farm or SEO spam campaign. The document body, though heavily corrupted, contains text related to a 'Ruger security six instruction manual' and the wkhtmltopdf generator, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link distribution attack.

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://gotvapestache.com/uploads/1/3/0/9/130969707/130969707.html#ruger+security+six+instruction+manual
    • http://bhpaschoolinspain.com/uploads/1/3/0/5/130551859/9991c6d316328.pdf
    • http://sunitagargcpa.com/uploads/1/3/0/5/130543488/pajuzuz.pdf
    • http://rainhasdosabor.com/uploads/1/3/0/8/130873769/vemiw_getike_vosin.pdf
    • http://otisladybug.com/uploads/1/3/0/8/130874350/mirabaxalew.pdf
    • http://gatheringhopehouse.org/uploads/1/3/0/6/130605176/lifakubevibop_mefalijimoxi_sagikomiwu_lonexugowi.pdf
    • http://bobrossartworkshop.net/uploads/1/3/0/7/130739234/kanibologuwumamave.pdf
    • http://merakifarmacy.com/uploads/1/3/0/3/130324370/16bc1099a.pdf
    • http://mpgtrucking.com/uploads/1/3/0/5/130539053/mexojovu.pdf
    • http://techsuny.com/uploads/1/3/0/4/130477805/6131669.pdf
    • http://www.maevanaturals.com/uploads/1/3/0/4/130477775/pidoro.pdf
    • http://laccdsustsainability.com/uploads/1/3/0/7/130775715/7c92ef4.pdf
    • http://grassycreekpress.com/uploads/1/3/0/4/130435569/jovevotofoxaxavobuw.pdf
    • http://centreformindfulness.ca/uploads/1/3/0/2/130289640/joxazerexedes.pdf
    • http://jwq1.com/uploads/1/3/0/2/130288401/beluralo.pdf
    • http://littlemister.net/uploads/1/3/0/8/130874277/wujef_jipakani.pdf
    • http://neilfoxhealthandfitness.com/uploads/1/3/0/4/130483581/kozipiremuro.pdf
    • http://www.simpleleaf.co.uk/uploads/1/3/0/7/130738973/123ffd1c0ed7659.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_off0000608c.bin
9cac075567e98d0c334e35bc5eb413a2622b1064462cf0412044003346ee3178		 pdf-font-stream PDF embedded font (sfnt) at offset 0x608C 8272 bytes

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