Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd9dab525f8d3fe2…

MALICIOUS

PDF

32.7 KB Created: 2018-06-11 09:34:52 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-07-24
MD5: f5fff9e9d4ee1bcccee3364ff3c5f13f SHA-1: 44acbbe98988232966b0b9db60a1ca15438d8dd2 SHA-256: cd9dab525f8d3fe25f8553ed92ce9cefb334530376c5e2b73601971dae9e10a0
130 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded URLs that point to a suspicious domain, likely intended to trick the user into downloading a malicious file. The ML classifier also flagged this PDF with high confidence. The presence of a download button heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9269

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-world-of-apex-lin.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=the-world-of-apex-lin.pdfIn PDF document text
    • http://www.achievement.org/achiever/maya-lin/In PDF document text
    • https://apex.chinapex.com/In PDF document text
    • http://www.stylintrucks.com/In PDF document text
    • https://www.slrlounge.com/In PDF document text
    • http://www.wjoud.com/In PDF document text
    • http://www.merrylinmuseum.com/encyclopdia-obscura/In PDF document text
    • https://www.fogworldcongress.com/conference/programIn PDF document text
    • http://designerrankings.com/In PDF document text
    • http://exoticgroceries.com.au/In PDF document text
    • https://worldairlinenews.com/In PDF document text
    • http://burlingtonnews.net/giants.htmlIn PDF document text
    • http://www.audiogrid.com/arsl.htmlIn PDF document text
    • http://www.new-techguide.com/In PDF document text
    • http://re-markings.com/OLDIS.htmIn PDF document text
    • http://riverside-resort.net/1/statics-mechanics-of-materials-beer-1st-edition-solutions.pdfIn PDF document text
    • http://riverside-resort.net/1/stagecraft-1-a-complete-guide-to-backstage-work.pdfIn PDF document text
    • http://riverside-resort.net/1/the-skeleton-cupboard-stories-from-a-clinical-psychologist-tanya-byron.pdfIn PDF document text
    • http://riverside-resort.net/1/the-dumont-diaries-1-4-alessandra-torre.pdfIn PDF document text
    • http://riverside-resort.net/1/theology-of-the-reformers-timothy-george.pdfIn PDF document text
    • http://riverside-resort.net/1/snowed-under.pdfIn PDF document text
    • http://riverside-resort.net/1/the-practice-of-statistics-4th-edition.pdfIn PDF document text
    • http://riverside-resort.net/1/suzuki-swift-sport-instrument-cluster-wiring.pdfIn PDF document text
    • http://riverside-resort.net/1/study-environmental-management.pdfIn PDF document text
    • http://riverside-resort.net/1/troubleshooting-canon-digital-camera.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/Tam_LinIn PDF document text
    • http://www.nybooks.com/articles/2000/11/02/making-the-memorial/In PDF document text
    • https://www.dignitymemorial.com/obituaries/apex-nc/justin-mcgee-7794651In PDF document text
    • https://en.wikipedia.org/wiki/Vietnam_Veterans_MemorialIn PDF document text
    • http://www.who.int/medicines/access/controlled-substances/PreReviewPregabalin.pdfIn PDF document text
    • http://wikimapia.org/In PDF document text
    • http://www.footballfanatics.com/In PDF document text
    • http://tvtropes.org/pmwiki/pmwiki.php/TookALevelInBadass/WesternAnimationIn PDF document text
    • http://www.sfc.hk/web/EN/alert-list/a.htmlIn PDF document text
    • http://www.newworldencyclopedia.org/entry/Social_changeIn 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_off00004732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4732 9856 bytes
SHA-256: 404a2d3dd706d5415fe98849297e359d823c1f8da5e9af2bc6e67416f57fdfeb
font_01_sfnt_off000066c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66C3 6444 bytes
SHA-256: 241b7ee79629cd964a12cf3f1c944ef64a807df35a0ffff90271c6b14e584014