Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8adcb2392d14db…

MALICIOUS

PDF

29.2 KB Created: 2018-06-11 09:31:56 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 7f5e9eeeb4c35b5c05cd647d3561be49 SHA-1: 5789e78335b46517df093467c7edc976864a3def SHA-256: cd8adcb2392d14db9770a9dfb930289c9a2a401ef0fc178253465718eb9bfc79
130 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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=us-songs-and-stories-chris-bachelder.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=us-songs-and-stories-chris-bachelder.pdfIn PDF document text
    • http://www.dragoncon.org/?q=announcements_by_dateIn PDF document text
    • https://leadershipnow.com/leadingblog/leadership/In PDF document text
    • http://www.writewords.org.uk/interviews/answers.asp?qid=6In PDF document text
    • http://www.pprize.com/Discussions.php/2017-PredictionIn PDF document text
    • http://www.sfondidesktop.eu/sfondi-arte.htmIn PDF document text
    • http://uncpbisdegree.com/1/tahitians-mind-and-experience-in-the-society-islands.pdfIn PDF document text
    • http://riverside-resort.net/1/what-is-the-climate-of-canada-year-round.pdfIn PDF document text
    • http://riverside-resort.net/1/walking-after-you-windry-ramadhina.pdfIn PDF document text
    • http://riverside-resort.net/1/vida-cotidiana-del-ecuador-snapshots-from-ecuador.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-economics-and-politics-of-climate-change.pdfIn PDF document text
    • http://riverside-resort.net/1/uss-mt-mckinley.pdfIn PDF document text
    • http://uncpbisdegree.com/1/share-a-scare-writing-your-own-scary-story.pdfIn PDF document text
    • http://uncpbisdegree.com/1/teahouse-ebook-emirain.pdfIn PDF document text
    • http://uncpbisdegree.com/1/special-needs-adoptions-practice-issues-garland-reference-library-of-social-science.pdfIn PDF document text
    • http://uncpbisdegree.com/1/study-guide-chapter-2-history-alive-5th-grade.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/Special:SearchIn PDF document text
    • https://www.telegraph.co.uk/culture/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://en.wikipedia.org/wiki/Wynonna_Earp_In 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_off00003887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3887 9904 bytes
SHA-256: 53b2c8978ae4a69a2fd8b7073323a74be9c145477f9dd9d5e73d1d555b0c20a9
font_01_sfnt_off0000581b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x581B 7320 bytes
SHA-256: ab9d14700c03b364b3f31aa590d658e2ccc569f2a4cb688455340e9ffb0373b8