Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca6f6a2b738b7e9…

MALICIOUS

PDF

31.4 KB Created: 2018-06-11 09:00:45 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-07
MD5: 132ca4a3ef8fb063ff8eda5dc9033ff1 SHA-1: d806849c7a11b73096598c05dc3d56de72209128 SHA-256: 4ca6f6a2b738b7e9e076b53aee3eeafb7409daf8eb89713cd01eae5ee3d3ec83
130 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded URLs that point to a domain known for distributing malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of a visual download button lure further supports a malicious intent. The document body, though partially corrupted, contains references to the same suspicious URLs, suggesting the primary goal is to trick the user into downloading a payload from these locations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9276

Heuristics 4

  • Fake 'free download' SEO-poisoning PDF critical PDF_SEO_FAKE_DOWNLOAD
    The ML classifier flagged this PDF AND it carries a visual download/call-to-action lure AND an off-domain server-side download-gateway link whose query string names a document payload. This three-signal conjunction is the fake-document / 'free PDF download' SEO-poisoning delivery pattern: the page is padded with benign decoy links to dilute classifier scores while funnelling the victim through the gateway to malware/scareware. Acting only on the conjunction keeps benign download-bearing PDFs from being misflagged.
  • PDF carries a PHP-gateway SEO-spam PDF link farm medium PDF_SEO_PHP_GATEWAY_LINK_FARM
    PDF contains four or more clickable links whose target is a `.php` gateway with a multi-word search-PHRASE document slug embedded after it (e.g. 'index.php?.../binary+options+trading+nz.pdf' or 'pdf.php/cialis-dosage-side-effects.pdf'). Legitimate PHP-served documents use a filename or numeric id, not a search-query phrase, so this is the generated SEO link-farm shape — pharma / binary-options / 'free download' spam that ranks for queries and routes users into payload/redirect chains. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://uncpbisdegree.com/download3.php?q=the-mysticism-of-the-cloud-of-unknowing.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=the-mysticism-of-the-cloud-of-unknowing.pdfIn PDF document text
    • https://www.paracletepress.com/samples/exc-cloud-of-unknowing-essential1-20.pdfIn PDF document text
    • http://www.frimmin.com/faith/mysticismintro.phpIn PDF document text
    • http://www.frimmin.com/faith/mysticismstart.phpIn PDF document text
    • http://www.kktanhp.com/index.htmIn PDF document text
    • http://www.umilta.net/bibliogr.htmlIn PDF document text
    • https://www.christianmeditation.org.uk/In PDF document text
    • http://www.gornahoor.net/In PDF document text
    • http://riverside-resort.net/1/tax-credits-and-intergovernmental-fiscal-relations.pdfIn PDF document text
    • http://riverside-resort.net/1/the-craft-of-stickmaking.pdfIn PDF document text
    • http://riverside-resort.net/1/trane-xr90-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/story-town-grade-4-lesson-24-meanings.pdfIn PDF document text
    • http://riverside-resort.net/1/toyota-corona-1987-wiring-diagram.pdfIn PDF document text
    • http://riverside-resort.net/1/street-sketchbook-journeys.pdfIn PDF document text
    • http://riverside-resort.net/1/teotihuacan-official-guide.pdfIn PDF document text
    • http://riverside-resort.net/1/the-regional-diversification-of-latin-200-bc-ad-600.pdfIn PDF document text
    • http://riverside-resort.net/1/the-life-you-were-born-to-live-finding-your-life-purpose.pdfIn PDF document text
    • http://riverside-resort.net/1/the-instagram-book-inside-the-online-photography-revolution.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://en.wikipedia.org/wiki/MysticismIn PDF document text
    • http://www.sacred-texts.com/myst/index.htmIn PDF document text
    • https://www.britannica.com/topic/mysticismIn PDF document text
    • https://en.wikipedia.org/wiki/John_CassianIn PDF document text
    • http://www.sacred-texts.com/chr/index.htmIn PDF document text
    • http://go.microsoft.com/fwlink/?LinkId=521839&CLCID=0409In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=246338&CLCID=0409In PDF document text
    • https://go.microsoft.com/fwlink/?linkid=868922In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=286759&CLCID=409In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=617297In PDF document text
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3F69 10552 bytes
SHA-256: a68b91fc1ccc10c5a274f3b6dbe0202ff083c999ee4b2d06de1dae981f71f8bd
font_01_sfnt_off000060ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60EC 6988 bytes
SHA-256: d5142db63aca483370a35ad7d4df44f1e506f067313b457116ec4b494db8eddf

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