Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1618358a1ea2685…

MALICIOUS

PDF

33.1 KB Created: 2018-06-11 09:32:09 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: e4670394207271398e6334a65991c475 SHA-1: cf6a555a3967e6d15dc674444e8e0338030ac9a9 SHA-256: f1618358a1ea2685d223fe5a6ac94baa274bdaaf4ba071f5c76ab8c298645c2c
130 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file was flagged as malicious by an ML classifier. It contains embedded URLs pointing to a domain that appears to be distributing malicious content. The presence of a 'download button' heuristic further supports the attack pattern of luring users to download a file. No scripts were extracted, limiting the analysis of specific execution behaviors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9340

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=spin-crossover-in-transition-metal-compounds-i-1st-edition.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=spin-crossover-in-transition-metal-compounds-i-1st-edition.pdfIn PDF document text
    • http://www.dma.jim.osaka-u.ac.jp/view?u=2767In PDF document text
    • http://www.eurasc.org/news/news.aspIn PDF document text
    • http://www.eurasc.org/new_mem.aspIn PDF document text
    • https://www.afdf.org/salmon-byproduct-and-coproduct-research/In PDF document text
    • http://www.sakutai.jp/wp/?cat=4In PDF document text
    • http://www.wolfbane.com/tv.htmIn PDF document text
    • http://www.solidaxle.org/Info/tech-help.htmIn PDF document text
    • http://hamburggermany.men/Hamburg-Germany/Hamburg-Germany_cc.phpIn PDF document text
    • http://fukuokajapan.loan/Zamboanga-Philippines/Zamboanga-Philippines-ky.phpIn PDF document text
    • http://shanagrant.com/In PDF document text
    • http://riverside-resort.net/1/the-right-way-to-play-chess.pdfIn PDF document text
    • http://riverside-resort.net/1/the-kingdom-and-glory-for-a-theological-genealogy-of-economy-government-giorgio-agamben.pdfIn PDF document text
    • http://riverside-resort.net/1/sibawayh-on-iimalah-text-translation-notes-and-analysis-1st-edition.pdfIn PDF document text
    • http://riverside-resort.net/1/the-joshua-priest-a-biography-of-faith.pdfIn PDF document text
    • http://riverside-resort.net/1/sona-northwestern.pdfIn PDF document text
    • http://riverside-resort.net/1/the-blood-guard-1-carter-roy.pdfIn PDF document text
    • http://riverside-resort.net/1/solutions-manual-probability-and-statistics-for-engineering-and-the-sciences.pdfIn PDF document text
    • http://riverside-resort.net/1/the-grilling-season-a-goldy-bear-culinary-mystery-7-diane-mott-davidson.pdfIn PDF document text
    • http://riverside-resort.net/1/the-dream-engine-kindle-edition-sean-platt.pdfIn PDF document text
    • http://riverside-resort.net/1/solving-equations-with-no-solution.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/CopperIn PDF document text
    • http://www.microsofttranslator.com/bv.aspx?ref=SERP&br=ro&mkt=en-US&dl=en&lp=JA_EN&a=http%3a%2f%2fwww.dma.jim.osaka-u.ac.jp%2fview%3fu%3d2767In PDF document text
    • https://www.nasdaq.com/news/In PDF document text
    • https://www.autoblog.com/green/In PDF document text
    • http://www.philly.com/philly/archives/In PDF document text
    • https://www.psychologytoday.com/us/blog/inside-the-box/201402/thinking-outside-the-box-misguided-ideaIn PDF document text
    • http://www.dictionary.com/e/s/word-of-the-year-list/In PDF document text
    • http://www.loot.co.za/index/html/index2584.htmlIn PDF document text
    • http://www.microsofttranslator.com/bv.aspx?ref=SERP&br=ro&mkt=en-US&dl=en&lp=JA_EN&a=http%3a%2f%2fwww.sakutai.jp%2fwp%2f%3fcat%3d4In 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_off0000476f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x476F 10132 bytes
SHA-256: 2e2eebfcc5b91f84c46a08b92f829ebad935f065b743fbe12565dd78042c25d1
font_01_sfnt_off000067bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67BB 6816 bytes
SHA-256: 6df83a55c72cf67960ccb642d589683a2556d5be5a84eea4c03d06aebf19d8d5