Malicious PDF — malware analysis report

Static analysis result for SHA-256 916546c75fba7d05…

MALICIOUS

PDF

35.0 KB Created: 2018-06-11 09:58:43 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: a4ab2b9e8bbe9c306a261b8216d8cf6e SHA-1: 5245e6188c4e572775e77d7f52bd84d847782f0c SHA-256: 916546c75fba7d05ac5a10dbe853dfedf56b7ef507a87708f817f2a38ae655a2
130 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded URLs that point to a suspicious domain, uncpbisdegree.com, which is likely used to serve malicious content. The ML classifier strongly flagged this PDF as malicious. The presence of a 'download' button lure further supports the malicious intent of tricking users into downloading a payload. No scripts were extracted, limiting the ability to determine the exact nature of the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9062

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=the-united-states-of-america.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=the-united-states-of-america.pdfIn PDF document text
    • http://riverside-resort.net/1/the-nations-favourite-food-fast-100-best-loved-recipes-for-busy-lives.pdfIn PDF document text
    • http://riverside-resort.net/1/short-essay-on-cancer.pdfIn PDF document text
    • http://riverside-resort.net/1/the-london-blitz-murders.pdfIn PDF document text
    • http://riverside-resort.net/1/smart-fortwo-manuale.pdfIn PDF document text
    • http://riverside-resort.net/1/staar-biology-assessments-module-1-answer-key.pdfIn PDF document text
    • http://riverside-resort.net/1/this-is-heroin-addiction.pdfIn PDF document text
    • http://riverside-resort.net/1/the-churchlands-and-their-critics.pdfIn PDF document text
    • http://riverside-resort.net/1/she-writes-love-sandi-lynn.pdfIn PDF document text
    • http://riverside-resort.net/1/tdi-40k-dsg-service.pdfIn PDF document text
    • http://riverside-resort.net/1/surviving-suicide-ebook-anna-kay-akana.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://www.usa.gov/about-the-usIn PDF document text
    • https://en.m.wikipedia.org/wiki/United_StatesIn PDF document text
    • https://en.wikipedia.org/wiki/United_States#EtymologyIn PDF document text
    • https://en.wikipedia.org/wiki/United_States#HistoryIn PDF document text
    • https://en.wikipedia.org/wiki/United_States#Geography,_climate,_and_environmentIn PDF document text
    • https://en.wikipedia.org/wiki/United_States#DemographicsIn PDF document text
    • https://en.m.wikipedia.org/wiki/The_United_States_of_America_%28band%29In PDF document text
    • https://en.wikipedia.org/wiki/The_United_States_of_America_%28band%29#Background_and_formationIn PDF document text
    • https://en.wikipedia.org/wiki/The_United_States_of_America_%28band%29#Performances_and_recordingIn PDF document text
    • https://en.wikipedia.org/wiki/The_United_States_of_America_%28band%29#Break-upIn PDF document text
    • https://en.wikipedia.org/wiki/The_United_States_of_America_%28band%29#LegacyIn PDF document text
    • https://www.amazon.com/United-States-America/dp/B0002CX1XYIn PDF document text
    • https://www.amazon.com/Rock-Music/b?ie=UTF8&node=40In PDF document text
    • https://www.amazon.com/Progressive-Rock-Music/b?ie=UTF8&node=292809In PDF document text
    • https://www.amazon.com/Progressive-Rock-Music/b?ie=UTF8&node=408264In PDF document text
    • https://wikitravel.org/en/United_States_of_AmericaIn PDF document text
    • https://www.britannica.com/place/United-StatesIn PDF document text
    • https://simple.wikipedia.org/wiki/United_StatesIn PDF document text
    • https://simple.wikipedia.org/wiki/United_States#GovernmentIn PDF document text
    • https://simple.wikipedia.org/wiki/United_States#PoliticsIn PDF document text
    • https://simple.wikipedia.org/wiki/United_States#LandIn PDF document text
    • https://simple.wikipedia.org/wiki/United_States#GeographyIn PDF document text
    • https://simple.wikipedia.org/wiki/United_States#EconomyIn PDF document text
    • https://simple.wikipedia.org/wiki/United_States#DemographicsIn PDF document text
    • https://www.gpo.gov/fdsys/pkg/CDOC-110hdoc50/pdf/CDOC-110hdoc50.pdfIn PDF document text
    • https://www.50states.com/In PDF document text
    • https://www.supremecourt.gov/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://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F6B 9784 bytes
SHA-256: 2f5ce9dc0048b0123cb34e19ffd195a6b4966b70f30ccba4f226f5f407135a40
font_01_sfnt_off00006eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB9 6768 bytes
SHA-256: 7503e3bec3b4bb5b55221d0574e762bbb7146265a666039f0dd828632386f7af

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