Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca9b063d664dd12c…

MALICIOUS

PDF

43.9 KB Created: 2018-06-11 08:18:35 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 75c37462fd5c7ce37cc4b251067d7f7b SHA-1: d4a2b36a8c8ab15fa53979940aeeb200c4dd19f8 SHA-256: ca9b063d664dd12ceae8c703f0f7e46a239811b8d9a599013bdb70409aca2572
130 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9250

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=summary-of-kid-khumalo-in-english-and-afrikaans.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=summary-of-kid-khumalo-in-english-and-afrikaans.pdfIn PDF document text
    • http://fjwellmade.com/pdf-reader/summary-of-kid-khumalo-in-english-and-afrikaans.pdfIn PDF document text
    • http://cetara.de/summary/of/summary_of_kid_khumalo_in_english_and_afrikaans.pdfIn PDF document text
    • http://ready-made-online.com/reads-online/summary-of-kid-khumalo-in-english-and-afrikaans.pdfIn PDF document text
    • http://megama.de/summary/of/summary_of_kid_khumalo_in_english_and_afrikaans.pdfIn PDF document text
    • http://qrser.de/summary/of/summary_of_kid_khumalo_in_english_and_afrikaans.pdfIn PDF document text
    • http://kataan.de/summary/of/summary_of_kid_khumalo_in_english_and_afrikaans.pdfIn PDF document text
    • http://www.rpgshinobi.org/su/of/summary-of-kid-khumalo-in-english-and-afrikaans.pdfIn PDF document text
    • http://openbooknesia.com/reads-online/summary-of-kid-khumalo-in-english-and-afrikaans.pdfIn PDF document text
    • http://brench.de/summary/of/summary_of_kid_khumalo_in_english_and_afrikaans.pdfIn PDF document text
    • http://coxrat.de/summary/of/summary_of_kid_khumalo_in_english_and_afrikaans.pdfIn PDF document text
    • http://riverside-resort.net/1/vittorio-the-vampire.pdfIn PDF document text
    • http://uncpbisdegree.com/1/subaru-e2-engine.pdfIn PDF document text
    • http://uncpbisdegree.com/1/sirius-sp4-tk1-satellite-radios-owners-manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/shop-manuals-kia-ceed.pdfIn PDF document text
    • http://uncpbisdegree.com/1/suzuki-gsxr-400-manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/starbucks-743175-coffee-makers-owners-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/you-and-me-forever-marriage-in-light-of-eternity-francis-chan.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-arithmetic-of-fundamental-groups-pia-2010.pdfIn PDF document text
    • http://riverside-resort.net/1/what-is-automatic-and-manual-transmission-in-car.pdfIn PDF document text
    • http://uncpbisdegree.com/1/techniques-of-developing-hybrids-in-vegetable-crops-1st-edition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://mymemory.translated.net/en/Afrikaans/English/op-soek-na-kid-khumalo-summary-in-englishIn PDF document text
    • http://gr12kortverhale.blogspot.com/2011/06/op-soek-na-kid-khumalo.htmlIn PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=617350In 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://mymemory.translated.net/en/Afrikaans/English/op-soek-naIn 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_off00006418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6418 13428 bytes
SHA-256: 8fac931db1bbb617ebbd82fedb27f47b66e0d9424cefa8469c2bac8ed8d220b5
font_01_sfnt_off00008d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D82 8100 bytes
SHA-256: 96cd2899a0a7bb5a25bee45fcdc179b5af88fbf54ad1551211f5085f23891816