Malicious PDF — malware analysis report

Static analysis result for SHA-256 472a49608d8e31b4…

MALICIOUS

PDF

32.8 KB Created: 2018-06-11 08:40:15 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 0eca5d432644c8508f0d9b759b75822a SHA-1: 45259919c8d8d1cfd251145658abd3a264bc74b2 SHA-256: 472a49608d8e31b41c82791826face9f4f1e4fa256b804f83eecd904eba57c87
130 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF document contains embedded URLs that point to a domain associated with malicious activity. The presence of a 'download button' heuristic and the ML classifier's high confidence score suggest a malicious intent to trick the user into downloading a file. The document body, though partially garbled, contains references to the same suspicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9123

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=triangular-ufos-an-estimate-of-the-situation.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=triangular-ufos-an-estimate-of-the-situation.pdfIn PDF document text
    • http://www.ufocasebook.com/triangles.htmlIn PDF document text
    • http://www.ufosnw.com/history.htmIn PDF document text
    • http://www.metatech.org/wp/ufos/secret-government-anti-gravity-fleet/In PDF document text
    • http://www.ufos-aliens.co.uk/cosmicapollo.htmlIn PDF document text
    • http://www.hyper.net/ufo/video-documentaries.htmlIn PDF document text
    • http://www.ufosightingsdaily.com/p/military-sightings.htmlIn PDF document text
    • http://www.nuforc.org/In PDF document text
    • http://altereddimensions.net/2012/skinwalker-ranchIn PDF document text
    • http://www.armaghplanet.com/blog/betty-hills-ufo-star-map-the-truth.htmlIn PDF document text
    • http://www.galactic-server.com/rune/iarga.htmlIn PDF document text
    • http://www.tanyakhovanova.com/MathBlog.htmlIn PDF document text
    • http://riverside-resort.net/1/solution-manual-advance-accounting-be.pdfIn PDF document text
    • http://riverside-resort.net/1/template-to-create-a-professional-conference-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/the-fountainhead-ayn-rand.pdfIn PDF document text
    • http://riverside-resort.net/1/toyota-harrier-manual-2005.pdfIn PDF document text
    • http://riverside-resort.net/1/toshiba-at100-tablet-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/termau-cerddoriaeth.pdfIn PDF document text
    • http://riverside-resort.net/1/the-big-book-of-endurance-training-and-racing-philip-maffetone.pdfIn PDF document text
    • http://riverside-resort.net/1/the-justification-of-god-an-exegetical-and-theological-study-romans-91-23-john-piper.pdfIn PDF document text
    • http://riverside-resort.net/1/steve-mcqueen-mesothelioma.pdfIn PDF document text
    • http://riverside-resort.net/1/the-borough-market-cookbook-meat-and-fish.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/UFOIn PDF document text
    • https://en.wikipedia.org/wiki/1561_celestial_phenomenon_over_NurembergIn PDF document text
    • http://rense.com/Datapages/ufodat1.htmIn PDF document text
    • http://nymag.com/selectall/2018/03/13-reasons-to-believe-aliens-are-real.htmlIn PDF document text
    • http://phenomena.nationalgeographic.com/2016/05/11/what-hillary-clinton-says-about-aliens-is-totally-misguided/In PDF document text
    • http://whale.to/b/sp/for1.htmlIn 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_off000043bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x43BF 10824 bytes
SHA-256: 6f80ca57dd9fc0c77f0120c1f07dd75276e6edd74e1858bada6c5f8cabc178a0
font_01_sfnt_off000065eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65EB 7080 bytes
SHA-256: dd23a15318206d86af1d33754a59dc79eadf601e9671e73828dccb7e24e65334