Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a7e02c52c79d2f…

MALICIOUS

PDF

33.4 KB Created: 2018-06-11 09:30:26 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 4f9b48aaae906da2fcf8a171b16e018d SHA-1: 15504c8de07a4f8ffcdaffb717a28d83e92706b2 SHA-256: 98a7e02c52c79d2f6a56c35df3274de91254e18a9cb8db4d1667d5ac647fbf3d
130 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9123

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=special-operations-executive-a-new-instrument-of-war-studies-in-intelligence.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=special-operations-executive-a-new-instrument-of-war-studies-in-intelligence.pdfIn PDF document text
    • http://patriotsquestion911.com/In PDF document text
    • http://www.psywarrior.com/VietnamOBPSYOPIn PDF document text
    • http://www.combatreform.org/paratrooper.htmIn PDF document text
    • http://www.combatreform.org/aesindex.htmIn PDF document text
    • http://www.psywarrior.com/MusicUsePSYOP.htmlIn PDF document text
    • http://www.bilderberg.org/bildhist.htmIn PDF document text
    • http://www.wakeupkiwi.com/news-articles-54.shtmlIn PDF document text
    • http://riverside-resort.net/1/the-tree-of-yoga.pdfIn PDF document text
    • http://riverside-resort.net/1/sound-storm-smp3-90r-car-receivers-owners-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/study-guide-template-ms-publisher.pdfIn PDF document text
    • http://riverside-resort.net/1/the-act-of-marriage.pdfIn PDF document text
    • http://riverside-resort.net/1/understanding-unix-linux-programming-a-guide-to-theory-and-practice.pdfIn PDF document text
    • http://riverside-resort.net/1/true-spirituality.pdfIn PDF document text
    • http://riverside-resort.net/1/the-sexual-life-of-catherine-m-millet.pdfIn PDF document text
    • http://riverside-resort.net/1/study-guide-25-2-key.pdfIn PDF document text
    • http://riverside-resort.net/1/teamwork-interactive-tasks-to-get-students-talking.pdfIn PDF document text
    • http://riverside-resort.net/1/the-next-decade-what-the-world-will-look-like.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://publicintelligence.net/u-s-navy-natops-instrument-flight-manual/In PDF document text
    • http://www.au.af.mil/info-ops/influence.htmIn PDF document text
    • https://en.wikipedia.org/wiki/Research_and_Analysis_WingIn PDF document text
    • https://www.dhs.gov/termsIn PDF document text
    • https://www.dhs.gov/site-linksIn PDF document text
    • https://medium.com/insurge-intelligence/why-google-made-the-nsa-2a80584c9c1In PDF document text
    • https://www.cia.gov/library/center-for-the-study-of-intelligence/csi-publications/csi-studies/studies/vol46no1/article05.htmlIn PDF document text
    • https://www.jstor.org/open/In PDF document text
    • http://conf.splunk.com/sessions/2016-sessions.htmlIn PDF document text
    • http://www.au.af.mil/au/awc/awcgate/awc-thry.htmIn 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/Staff_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_off000046a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x46A7 10460 bytes
SHA-256: 55a419fb60632d6ccaf375ec804052ccd6c04399d747a9f3892a74aff0d1b749
font_01_sfnt_off000067ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67CA 7220 bytes
SHA-256: 55d1d21c0d9e584b72b1decc6f9f81348371f0a72b21861394cb30c100348491