Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dfd35d4594f4fea…

MALICIOUS

PDF

28.0 KB Created: 2018-06-11 09:02:11 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 5c2fd1c4fca763c57a885ba9d5c9d841 SHA-1: 3a5bca6b41b940033d4acd99d0a9f77b606c3635 SHA-256: 1dfd35d4594f4feadbd1ca458a695a3a2da085ec29195d33cdb027849de708e6
130 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9683

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=wbuhs-bhms-question-papers.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=wbuhs-bhms-question-papers.pdfIn PDF document text
    • https://www.homeobook.com/kerala-md-homoeopathy-entrance-exam-question-papers-2016/In PDF document text
    • https://www.homeobook.com/category/question-papers/md-hom-question-papers/In PDF document text
    • http://rguhs.ac.in/In PDF document text
    • http://uncpbisdegree.com/1/thats-not-my-pony-usborne-touchy-feely-books.pdfIn PDF document text
    • http://uncpbisdegree.com/1/supreme-essay-discount-code.pdfIn PDF document text
    • http://riverside-resort.net/1/wiley-plus-accounting-answers-chapter-13.pdfIn PDF document text
    • http://riverside-resort.net/1/watch-comic-book-movies-online.pdfIn PDF document text
    • http://riverside-resort.net/1/what-do-snakes-see.pdfIn PDF document text
    • http://riverside-resort.net/1/what-was-the-montgomery-bus-boycott.pdfIn PDF document text
    • http://uncpbisdegree.com/1/sony-cdx-gt250mp-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/vocab-book-level-d-answers.pdfIn PDF document text
    • http://uncpbisdegree.com/1/step-by-medical-coding-workbook-answers.pdfIn PDF document text
    • http://riverside-resort.net/1/wedding-card-designs-muslim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.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_off000032ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32AB 10436 bytes
SHA-256: 56c53bc9710894327621d59def6e61d3aaae6046b6308b6efd4db44d8e258929
font_01_sfnt_off000053af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53AF 7304 bytes
SHA-256: 5269ea68708f813453dd2f94862af8d75c5e8a5979dc3c7e3f6ced103fc6b96a