Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b3ccf73ef31aa9…

MALICIOUS

PDF

35.9 KB Created: 2018-06-11 08:34:22 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-04
MD5: dcabde8446721f687d94c19e0b249fc5 SHA-1: 933be15bf5bf37d7fcd5ef67c60c55f6c1ab0d08 SHA-256: c1b3ccf73ef31aa94174dd107a9803c4cb5d0e06113d87613e54183f6aee1669
130 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The ML classifier flagged this PDF as malicious with high confidence. The document contains embedded URIs pointing to a suspicious domain, suggesting a download lure. The presence of a visual download button heuristic further supports this attack pattern. No scripts were extracted from this sample, limiting the ability to determine specific payload delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9136

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-swedish-room-creating-the-look.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=the-swedish-room-creating-the-look.pdfIn PDF document text
    • http://www.dreamhomedecorating.com/swedish-country-decorating.htmlIn PDF document text
    • http://www.dreamhomedecorating.com/scandinavian-interior-design.htmlIn PDF document text
    • http://www.greenkitchenstories.com/swedish-chocolate-biscuits/In PDF document text
    • https://www.scc.org.uk/In PDF document text
    • http://www.sprinklebakes.com/2013/12/st-lucia-buns-swedish-saffron-christmas.htmlIn PDF document text
    • http://hative.com/pretty-living-room-colors-for-inspiration/In PDF document text
    • https://www.orindaben.com/pages/rooms/affirmations_room/In PDF document text
    • http://willkempartschool.com/category/drawing/In PDF document text
    • http://www.icyousee.org/kalmar.htmlIn PDF document text
    • http://www.wfotcongress.org/congress-programme.phpIn PDF document text
    • http://www.room-to-bloom.com/blog/In PDF document text
    • http://www.susanbranch.com/learning-to-sew-home-arts-embroidery-flour-sack-dishtowels-sewing-room/In PDF document text
    • https://unclutterer.com/2017/10/17/organize-inevitable-swedish-death-cleaning/In PDF document text
    • http://www.bilderberg.org/2001.htmIn PDF document text
    • http://www.backpackingnorth.com/blog/2014/8/18/views-from-sarekIn PDF document text
    • http://www.treehotel.se/en/rooms/the-mirrorcubeIn PDF document text
    • http://www.drawrm.com/lights.htmIn PDF document text
    • http://riverside-resort.net/1/writing-paper-1st-grade-for-friendship.pdfIn PDF document text
    • http://riverside-resort.net/1/women-in-the-philippines.pdfIn PDF document text
    • http://uncpbisdegree.com/1/stepbrother-wants-his-twisted-game-book-eight.pdfIn PDF document text
    • http://uncpbisdegree.com/1/short-term-accident-health-insurance.pdfIn PDF document text
    • http://uncpbisdegree.com/1/sylvania-dvl245g-dvd-players-owners-manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-adam-and-joe-book.pdfIn PDF document text
    • http://uncpbisdegree.com/1/sun-after-dark-flights-into-the-foreign-pico-iyer.pdfIn PDF document text
    • http://uncpbisdegree.com/1/serving-coloring-page.pdfIn PDF document text
    • http://uncpbisdegree.com/1/solar-powered-model-car-design.pdfIn PDF document text
    • http://uncpbisdegree.com/1/solutions-to-managerial-accounting-14th-edition-garrison.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://www.ikea.com/au/en/In PDF document text
    • https://www.ikea.com/us/en/store/pittsburgh/activitiesIn PDF document text
    • http://www.designsponge.com/2018/01/a-swedish-family-home-filled-with-art-and-old-time-charm.htmlIn PDF document text
    • http://www.businessinsider.com/the-11-best-advertising-campaigns-of-2016-2017-3In PDF document text
    • https://en.wikiquote.org/wiki/Swedish_proverbsIn PDF document text
    • https://steamcommunity.com/steamvrIn PDF document text
    • http://nationalpost.com/news/producer-and-dj-known-as-avicii-has-been-found-deadIn PDF document text
    • https://www.elledecor.com/design-decorate/trends/g2475/scandinavian-trends/In PDF document text
    • https://www.imdb.com/name/nm1297015/bioIn PDF document text
    • https://www.popularmechanics.com/military/navy-ships/a19784775/gotland-class-sub-ronald-reagan-war-games/In PDF document text
    • https://www.hindawi.com/journals/nrp/2016/1797014/In PDF document text
    • https://www.ft.com/content/63191604-417f-11e8-803a-295c97e6fd0bIn PDF document text
    • http://www.travelandleisure.com/articles/creating-an-italian-cashmere-kingdom-in-umbriaIn 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_off000050c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50C2 10064 bytes
SHA-256: 774d6117d6db77132cf4a77f3c59296765c0c8df06eae9d1f11ca79ec21319a3
font_01_sfnt_off000070c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70C7 7048 bytes
SHA-256: 82968a704057298a77fbfef9f88e448515d1aa0fed1eb7fc2dd5e3dca18ed09e