Malicious PDF — malware analysis report

Static analysis result for SHA-256 791e2381c1722b08…

MALICIOUS

PDF

36.4 KB Created: 2020-06-03 08:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0363952dbe6dd891c6c4792e593c9f71 SHA-1: 2c240a73a4e96946da370eddfab71e478e7567ff SHA-256: 791e2381c1722b08b0e172381dcfdf039180b78a6d45011531fe00cfef99c008
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many of which point to PDF files with numeric slugs, indicative of a link farm. The document body, though partially corrupted, mentions 'Elite dangerous engineers unlock guide', suggesting a lure to entice users to click on these links. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm heuristic further supports malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://strigiformae.net/uploads/1/3/1/4/131407292/131407292.html#elite+dangerous+engineers+unlock+guide
    • http://mail.thebyrdfeedermeals.com/uploads/1/3/0/3/130323593/subibolemoxasisuv.pdf
    • http://aiace-se.com/uploads/1/3/0/8/130814195/maxofavolamedo.pdf
    • http://twobillionheartbeats.com/uploads/1/3/1/4/131438804/5171290.pdf
    • http://chunslandscape.net/uploads/1/3/1/6/131636712/361f29603d7846c.pdf
    • http://northernpacificbuilder.com/uploads/1/3/0/4/130483629/1895887.pdf
    • http://designsbylanab.com/uploads/1/3/1/6/131637034/kilolodel.pdf
    • http://strigiformae.net/uploads/1/3/1/4/131407292/terms.html
    • http://strigiformae.net/uploads/1/3/1/4/131407292/dmca.html
    • http://strigiformae.net/uploads/1/3/1/4/131407292/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://levejaru304222751.files.wordpress.com/2020/06/47752364667.pdf
    • https://wumudatimi.files.wordpress.com/2020/05/89148006899.pdf
    • https://kudivex.files.wordpress.com/2020/05/fonataket.pdf
    • https://fupalowonega.files.wordpress.com/2020/05/jutigikotap.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063a7.bin
a7c85db91d666f83225579ea57178ffe4f281080182c07c218b807840d73dedb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63A7 10108 bytes

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