Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e051e2335fa8112…

MALICIOUS

PDF

30.5 KB Created: 2018-06-11 08:51:22 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 51f3a366c1ea452c9f8022a781dd8776 SHA-1: 6fafd91d1e85b7059cb3d110eb7d7e546baa28e3 SHA-256: 4e051e2335fa811297b74dbe80009aaedafb0e3677858cfc023a80cd3ca6cc0b
130 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9652

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-kings-speech-how-one-man-saved-british-monarchy-mark-logue.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=the-kings-speech-how-one-man-saved-british-monarchy-mark-logue.pdfIn PDF document text
    • https://erenow.com/biographies/In PDF document text
    • http://www.abitofhistory.net/html/rhw/m.htmIn PDF document text
    • http://uncpbisdegree.com/1/smc-smcbglscx1-owners-manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/steps-we-took.pdfIn PDF document text
    • http://uncpbisdegree.com/1/solution-for-biology-obj-and-essay-2015.pdfIn PDF document text
    • http://uncpbisdegree.com/1/story-of-the-chinese-zodiac-english-korean.pdfIn PDF document text
    • http://uncpbisdegree.com/1/sportstuff-case-study-with-solution.pdfIn PDF document text
    • http://uncpbisdegree.com/1/service-manual-hp-2055.pdfIn PDF document text
    • http://uncpbisdegree.com/1/solutions-manual-inorganic-5th-edition-miessler.pdfIn PDF document text
    • http://uncpbisdegree.com/1/stihl-week-whacker-fs-55-rc-parts-manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/succession-planning-and-management-a-guide-to-organizational-systems-and-practices.pdfIn PDF document text
    • http://riverside-resort.net/1/vauxhall-astra-h-engine-manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://www.telegraph.co.uk/culture/books/8203371/The-Kings-Speech-how-Lionel-Logue-cured-King-George-VIs-stammer.htmlIn PDF document text
    • http://tvtropes.org/pmwiki/pmwiki.php/Main/KingIncognitoIn PDF document text
    • https://www.cnn.com/videosIn PDF document text
    • http://www.filmsite.org/sexinfilms22.htmlIn PDF document text
    • https://www.amazon.com/movies-tv-dvd-bluray/b?node=2625373011In PDF document text
    • https://www.onelook.com/pm/In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=617350In 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_off00003c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3C42 10064 bytes
SHA-256: 5dcdc7a02a6d9729ea0686a6c52bd531bdc124ce5d693f57757db0341bfa7d1a
font_01_sfnt_off00005c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C60 7540 bytes
SHA-256: 09316826b0059f8ca63e8a86f3db313a77f20b810604c9dcf6543d03bccb82ff