Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd32e882bb9b50a2…

MALICIOUS

PDF

33.9 KB Created: 2018-06-11 08:57:27 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: bca5034d6dafd447f75cc2c71a86fbaf SHA-1: 7608b8da8a5a9e66f61c3dd9219a05351fb04144 SHA-256: bd32e882bb9b50a2defd903b2ce85ff399a2d5e4076f1c520b3bfcdd602bd84b
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded URLs pointing to a suspicious domain, uncptbisdegree.com, which is likely used to host malicious content. The ML classifier flagged this PDF with high confidence, and the presence of a visual download button further supports a malicious intent to trick the user into downloading a file. The document body also contains these suspicious URLs, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9642

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=third-grade-lesson-for-the-appropriate-measure.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=third-grade-lesson-for-the-appropriate-measure.pdfIn PDF document text
    • https://www.georgiastandards.org/Georgia-Standards/Frameworks/3rd-Math-Grade-Level-Overview.pdfIn PDF document text
    • http://maccss.ncdpi.wikispaces.net/file/view/3rdGradeUnit.pdfIn PDF document text
    • http://www.teach-nology.com/teachers/lesson_plans/math/k2/In PDF document text
    • http://www.lpssonline.com/site5521.phpIn PDF document text
    • https://www.teacher.org/lesson-plans/3rd-grade/In PDF document text
    • https://www.uen.org/core/core.do?courseNum=3030In PDF document text
    • http://lessonplanspage.com/music/eighth-grade/In PDF document text
    • http://www.pdesas.org/Standard/ViewsIn PDF document text
    • http://www.phschool.com/In PDF document text
    • https://www.internet4classrooms.com/skills_3rd_science.htmIn PDF document text
    • http://www.fcrr.org/assessment/pdf/smallgroupalternativelessonstructures.pdfIn PDF document text
    • http://www.edhelper.com/ReadingComprehensions_Grade3.htmlIn PDF document text
    • http://www.jumpstart.com/teachers/curriculum/grade-based/1st-grade-curriculumIn PDF document text
    • https://www.georgiastandards.org/Georgia-Standards/Frameworks/5th-Math-Grade-Level-Overview.pdfIn PDF document text
    • http://www.123helpme.com/search.asp?text=gradeIn PDF document text
    • http://uncpbisdegree.com/1/the-where-the-heart-lives-collection.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-ultimate-vegan-guide-compassionate-living-without-sacrifice-erik-marcus.pdfIn PDF document text
    • http://uncpbisdegree.com/1/wyrd-stories.pdfIn PDF document text
    • http://uncpbisdegree.com/1/witch-hunt-syd-moore.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-wildflower-path-flower-trilogy-book-3.pdfIn PDF document text
    • http://uncpbisdegree.com/1/zh-10000-atlas-copco-manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/zen-ghosts-jon-j-muth.pdfIn PDF document text
    • http://uncpbisdegree.com/1/todays-green-berets-u-s-army-special-forces-groups.pdfIn PDF document text
    • http://uncpbisdegree.com/1/wedding-invitation-cards-designs-with-price-india.pdfIn PDF document text
    • http://uncpbisdegree.com/1/virology-reports.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://www.education.com/common-core/third-grade/math/In PDF document text
    • https://www.time4learning.com/education/fourth_grade.shtmlIn PDF document text
    • https://www.time4learning.com/scope-sequence/1st-math.shtmlIn PDF document text
    • https://www.education.com/worksheets/third-grade/measurement/In PDF document text
    • http://www.readingrockets.org/article/instruction-metacognitive-strategies-enhances-reading-comprehension-and-vocabularyIn PDF document text
    • http://www.educationworld.com/a_lesson/03/lp319-01.shtmlIn PDF document text
    • https://www.ixl.com/math/grade-4In PDF document text
    • http://turnitin.com/In PDF document text
    • http://www.educationworld.com/a_tsl/archives/soc_sci.shtmlIn 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_off000049b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49B1 10056 bytes
SHA-256: 043d1cf36c619ada34613f221737a9df188d8306fdd6a5bf7cab8a5b14e778a2
font_01_sfnt_off000069be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69BE 7080 bytes
SHA-256: 5c02ec902e5229c074774f87f2edaec250d79dc80056c03083093f9e34e30c92