Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf05fa65de767530…

MALICIOUS

PDF

33.0 KB Created: 2018-06-11 09:12:14 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: a4514b134872fe3b9f0c4045145cb915 SHA-1: 7dcd3e2b0e7536dcd5243df76380159857e70253 SHA-256: cf05fa65de767530d1617ddcefee4f6ffb3b1ab962a1ddedc2ef3bc035d00478
130 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded URLs that point to a domain associated with malicious activity, specifically a download link for a PDF titled 'world poverty for dummies'. The ML classifier strongly flagged this PDF as malicious. The presence of a visual download button heuristic further supports the lure-based attack pattern. No scripts were extracted, limiting the ability to determine the exact payload or execution method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9340

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-poverty-for-dummies.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=world-poverty-for-dummies.pdfIn PDF document text
    • https://www.islam-for-dummies.com/In PDF document text
    • http://www.michaelparenti.org/Imperialism101.htmlIn PDF document text
    • https://prepareforchange.net/2018/04/03/extreme-poverty-returns-to-america/In PDF document text
    • http://www.rooshv.com/credit-default-swaps-for-dummiesIn PDF document text
    • http://www.bibme.org/In PDF document text
    • http://www.econterms.com/econtent.htmlIn PDF document text
    • http://www.wacc.org.uk/In PDF document text
    • http://www.unseen-pedia.com/united-nations-u-n-agenda-21-depopulation-95-world-year-2030-now-underway-signed-approved-200-world-leaders/In PDF document text
    • http://www.whoismcafee.com/the-travel-guide/In PDF document text
    • https://chiefessays.net/110-cause-and-effect-essay-topics-will-provide-you-with-fresh-ideas/In PDF document text
    • http://www.naturalmoney.org/macroeconomics.htmlIn PDF document text
    • http://riverside-resort.net/1/soa-in-practice-the-art-of-distributed-system-design.pdfIn PDF document text
    • http://riverside-resort.net/1/the-blessing-nancy-mitford.pdfIn PDF document text
    • http://riverside-resort.net/1/the-limits-of-racial-domination-plebeian-society-in-colonial-mexico-city-1660-1720.pdfIn PDF document text
    • http://riverside-resort.net/1/toyota-2e-te-vacuum-diagram.pdfIn PDF document text
    • http://riverside-resort.net/1/torrent-river-of-time-3-lisa-tawn-bergren.pdfIn PDF document text
    • http://riverside-resort.net/1/the-first-american-life-and-times-of-benjamin-franklin-hw-brands.pdfIn PDF document text
    • http://riverside-resort.net/1/sobre-heroes-y-tumbas.pdfIn PDF document text
    • http://riverside-resort.net/1/the-out-of-town-expert-w-a-briefcase-by-doug-wead.pdfIn PDF document text
    • http://riverside-resort.net/1/ssc-je-electrical-answer-key-2012.pdfIn PDF document text
    • http://riverside-resort.net/1/stoichiometry-ch-12-test.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.dummies.com/store/Education/History-Biography-Law-Politics.htmlIn PDF document text
    • http://www.dummies.com/store/product/Catholicism-For-Dummies-3rd-Edition.productCd-1119295602,navId-322516.htmlIn PDF document text
    • https://ourworldindata.org/income-inequalityIn PDF document text
    • http://www.fao.org/docrep/W0073E/w0073e03.htmIn PDF document text
    • https://en.wikipedia.org/wiki/Jewish_conspiracyIn PDF document text
    • http://www.philly.com/philly/archives/In PDF document text
    • https://www.telegraph.co.uk/news/In PDF document text
    • http://foreignpolicy.com/2015/01/19/the-last-country-in-the-world-where-divorce-is-illegal-philippines-catholic-church/In PDF document text
    • https://www.ipcc.ch/In PDF document text
    • https://www.telegraph.co.uk/opinion/In 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_off00004648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4648 10436 bytes
SHA-256: 49b0949e5986c17ac23e14993597813c1759503f92f1100d561115821143565f
font_01_sfnt_off00006780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6780 6608 bytes
SHA-256: 05e67a6fa8b6ea673303801d9541d0cddc960679cf63d0c1f8013d32ff8cd8b4