Malicious PDF — malware analysis report

Static analysis result for SHA-256 a383caa9e1a80726…

MALICIOUS

PDF

34.5 KB Created: 2018-06-11 08:14:14 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-08-10
MD5: 0d4518efc857addf224a7fb9c0a8ef99 SHA-1: 4995d344dbf77c9a83a984eb3cb2f5efda7bd75d SHA-256: a383caa9e1a8072673665949994bdf2bcad0ca5779e4e90259aec7144717be7b
130 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF document contains embedded URLs that point to a suspicious domain, likely intended to deliver a malicious payload. The ML classifier flagged this PDF with high confidence. The document body and heuristics suggest a lure related to the Lusitania, with a call-to-action to download a file. No scripts were extracted from this sample, limiting the ability to determine the exact execution flow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9395

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=what-was-the-lusitania.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=what-was-the-lusitania.pdfIn PDF document text
    • http://www.firstworldwar.com/features/lusitania.htmIn PDF document text
    • http://www.lusitania.co.za/In PDF document text
    • http://www.eyewitnesstohistory.com/lusitania.htmIn PDF document text
    • https://lusitaniabank.com/In PDF document text
    • http://lusitana.pt/In PDF document text
    • http://www.titanicandco.com/lusitania.htmlIn PDF document text
    • http://www.lusitaniaprimary.co.zw/In PDF document text
    • http://www.litlovers.com/reading-guides/14-non-fiction/10189-dead-wake-larsonIn PDF document text
    • http://www.lusitania.pt/helpU/In PDF document text
    • http://riverside-resort.net/1/shiawassee-motorsports-birch-run-mi.pdfIn PDF document text
    • http://riverside-resort.net/1/sql-practice-problems-with-solutions.pdfIn PDF document text
    • http://riverside-resort.net/1/sony-dsc-t100-user-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/tipi-heritage-of-the-great-plains.pdfIn PDF document text
    • http://riverside-resort.net/1/society-against-the-state-essays-in-political-anthropology.pdfIn PDF document text
    • http://riverside-resort.net/1/timon-de-atenas.pdfIn PDF document text
    • http://riverside-resort.net/1/subaru-robin-ex-30-carburetor-installation-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/sony-playstation-3-owners-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/sewell-1992.pdfIn PDF document text
    • http://riverside-resort.net/1/starlight-xpress-lodestar-autoguider-review.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/RMS_LusitaniaIn PDF document text
    • https://www.history.com/topics/world-war-i/lusitaniaIn PDF document text
    • https://es.wikipedia.org/wiki/LusitaniaIn PDF document text
    • http://www.historynet.com/fateful-voyage-of-lusitania.htmIn PDF document text
    • https://it.wikipedia.org/wiki/LusitaniaIn PDF document text
    • http://www.microsofttranslator.com/bv.aspx?ref=SERP&br=ro&mkt=en-US&dl=en&lp=IT_EN&a=https%3a%2f%2fit.wikipedia.org%2fwiki%2fLusitaniaIn PDF document text
    • http://www.microsofttranslator.com/bv.aspx?ref=SERP&br=ro&mkt=en-US&dl=en&lp=PT_EN&a=http%3a%2f%2flusitana.pt%2fIn PDF document text
    • https://www.barnesandnoble.com/w/dead-wake-erik-larson/1119739955In PDF document text
    • https://www.history.com/this-day-in-history/lusitania-sinksIn PDF document text
    • http://www.slate.com/articles/news_and_politics/history/2015/05/lusitania_sinking_reliving_the_infamous_german_u_boat_attack_through_the.htmlIn PDF document text
    • http://www.bbc.co.uk/news/uk-northern-ireland-43630515In PDF document text
    • http://www.renfe.com/EN/viajeros/larga_distancia/productos/trenhotel.htmlIn PDF document text
    • http://www.renfe.com/EN/viajeros/index.htmlIn PDF document text
    • http://www.renfe.com/EN/viajeros/horarios.htmlIn PDF document text
    • http://www.renfe.com/EN/viajeros/larga_distancia/index.htmlIn PDF document text
    • http://www.renfe.com/EN/viajeros/larga_distancia/productos/index.htmlIn PDF document text
    • http://www.dailymail.co.uk/sciencetech/article-1254788/Why-women-children-saved-Titanic-Lusitania.htmlIn PDF document text
    • http://www.microsofttranslator.com/bv.aspx?ref=SERP&br=ro&mkt=en-US&dl=en&lp=PT_EN&a=http%3a%2f%2fwww.lusitania.pt%2fhelpU%2fIn 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_off00004b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B1A 10496 bytes
SHA-256: 5d4c609f62a4fb10a8e64bcff3e3937914554bb23603323090b0bdbe78e83918
font_01_sfnt_off00006c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C5C 6836 bytes
SHA-256: 35d01461b9e1b1450b2d370874c6f55a86fa8e1b18e280cb936b1c4aa5e1b64e