Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c2b04358579fda…

MALICIOUS

PDF

29.9 KB Created: 2018-06-11 08:23:01 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: f260750e9f9cdbcef461907a6f8fa41e SHA-1: c3aa472d40011b627a84ca3cc329d8ac22e40195 SHA-256: b8c2b04358579fda2965919ff153561cb7eb76d20a7a27ccbae4c45e0a21d9dd
130 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF document contains embedded URLs that mimic search engine results, specifically pointing to a download link for a 'world-war-ii-erupts-worksheet.pdf'. The ML classifier strongly flagged this PDF as malicious. The presence of external URIs and the overall structure suggest a social engineering lure to trick the user into downloading a potentially harmful file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9525

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=world-war-ii-erupts-worksheet.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=world-war-ii-erupts-worksheet.pdfIn PDF document text
    • http://www.thematthatters.com/US.phpIn PDF document text
    • http://www.pageinsider.com/In PDF document text
    • http://www.dailycrow.com/In PDF document text
    • http://hamburggermany.men/Hamburg-Germany/Hamburg-Germany_bb.phpIn PDF document text
    • http://www.themilkweed.com/TheIn PDF document text
    • http://myschool.co.il/ajial/?p=1922In PDF document text
    • http://riverside-resort.net/1/the-battle-for-the-trinity-the-debate-over-inclusive-god-language.pdfIn PDF document text
    • http://riverside-resort.net/1/sobre-la-cultura-y-el-arte-popular-on-the-culture-and-the-popular-art.pdfIn PDF document text
    • http://riverside-resort.net/1/the-grand-design.pdfIn PDF document text
    • http://riverside-resort.net/1/study-guide-questions-for-fahrenheit-451.pdfIn PDF document text
    • http://riverside-resort.net/1/solution-manual-john-hull-international-edition.pdfIn PDF document text
    • http://riverside-resort.net/1/surgical-nursing-ignatavicius-workman-test-bank-7edition.pdfIn PDF document text
    • http://riverside-resort.net/1/the-twins-saskia-sarginson.pdfIn PDF document text
    • http://riverside-resort.net/1/solution-manual-electronic-communication-systems-by-wayne-tomasi.pdfIn PDF document text
    • http://riverside-resort.net/1/the-gift-of-the-stranger-faith-hospitality-and-foreign-language-learning.pdfIn PDF document text
    • http://riverside-resort.net/1/tecumseh-8-hp-engine-manual-choke.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/Timeline_of_environmental_historyIn PDF document text
    • https://www.psychologytoday.com/us/blog/inside-the-box/201402/thinking-outside-the-box-misguided-ideaIn PDF document text
    • http://www.ascd.org/publications/books/108051/chapters/Managing-a-Classroom.aspxIn PDF document text
    • http://www.dictionary.com/e/s/word-of-the-year-list/In PDF document text
    • http://www.microsofttranslator.com/bv.aspx?ref=SERP&br=ro&mkt=en-US&dl=en&lp=AR_EN&a=http%3a%2f%2fmyschool.co.il%2fajial%2f%3fp%3d1922In 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_off00003a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3A9A 10396 bytes
SHA-256: d16d7a4ab8f037f03c1d5991e7531248aafc8da3b97f41de1b8bbe7c25febb79
font_01_sfnt_off00005ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BA4 6900 bytes
SHA-256: ccd99e66795958eaf7439577d6803d44949b300d9b647d275208d8f899cc48a6