Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa7afb0d39b1e39…

MALICIOUS

PDF

34.6 KB Created: 2018-06-11 08:17:48 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-07-24
MD5: 05b9a0dcaa30be1a65cafa29f0994460 SHA-1: 02c642ff6fe66de8959669fe45b6d2cfbf893721 SHA-256: 3fa7afb0d39b1e39a5152b102c865af3baeea66fc8df98d6bf18315922caad13
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains embedded URLs pointing to a suspicious domain, uncpbisdegree.com, which are likely used for malware distribution or phishing. The document body, though partially corrupted, suggests a lure related to a children's story to trick users into downloading the file. The ML classifier also flagged this PDF as malicious with high confidence.

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=the-iron-man-a-childrens-story-in-five-nights.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=the-iron-man-a-childrens-story-in-five-nights.pdfIn PDF document text
    • https://ironordermc.com/WhoAreWe/IronOrderNews.aspxIn PDF document text
    • https://www.costumebox.com.au/kids-costumes.htmlIn PDF document text
    • https://hudsonchildrensbookfestival.com/authors-illustrators/In PDF document text
    • http://www.zhealthinfo.com/doctor.htmIn PDF document text
    • http://www.tvsubtitles.eu/search.phpIn PDF document text
    • https://unblockall.org/In PDF document text
    • http://www.theliterarylink.com/questions_otherbooks.htmlIn PDF document text
    • http://www.kellscraft.com/textcontentssubjectlist.htmlIn PDF document text
    • http://www.childofchildrens.org/body.cfm?xyzpdqabc=0&id=20&action=full_listIn PDF document text
    • http://www.daypoems.net/poems/1900.htmlIn PDF document text
    • https://ipsum.im/In PDF document text
    • http://toptvshows.co/suits-1-vIn PDF document text
    • https://the1940sexperiment.com/100-wartime-recipes/In PDF document text
    • http://uncpbisdegree.com/1/the-good-bad-and-infernal-guy-adams.pdfIn PDF document text
    • http://uncpbisdegree.com/1/subject-and-predicate-worksheets-with-answers.pdfIn PDF document text
    • http://uncpbisdegree.com/1/southtown-tres-navarre-5-rick-riordan.pdfIn PDF document text
    • http://riverside-resort.net/1/unit-5-test-answers-for-american-govt.pdfIn PDF document text
    • http://riverside-resort.net/1/verizon-htc-droid-incredible-manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/short-scary-stories-for-5th-grade.pdfIn PDF document text
    • http://riverside-resort.net/1/where-did-jackie-robinson-grow-up.pdfIn PDF document text
    • http://riverside-resort.net/1/vw-polo-94-99-manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/temples-tombs-amp-hieroglyphs-a-popular-history-of-ancient-egypt-barbara-mertz.pdfIn PDF document text
    • http://uncpbisdegree.com/1/spss-19-manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://www.amazon.co.uk/Iron-Man-Childrens-Story-Nights/dp/0571226124In PDF document text
    • https://www.amazon.co.uk/Young-Adult-Books/b?ie=UTF8&node=52In PDF document text
    • https://www.amazon.co.uk/Literature-Young-Adult-Books/b?ie=UTF8&node=280211In PDF document text
    • https://www.amazon.co.uk/b?ie=UTF8&node=5346596031In PDF document text
    • http://tvtropes.org/pmwiki/pmwiki.php/Characters/FiveNightsAtFreddysIn PDF document text
    • http://biblehub.com/childrens/The_Story_of_Job.htmIn PDF document text
    • http://www.gutenberg.org/browse/authors/pIn PDF document text
    • https://www.yahoo.com/lifestyle/tagged/health/In PDF document text
    • http://www.adultswim.com/videos/In PDF document text
    • https://www.telegraph.co.uk/culture/In PDF document text
    • https://www.riaa.com/gold-platinum/In PDF document text
    • http://www.jango.com/musicIn PDF document text
    • http://www.tvguide.com/tvshows/In 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://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B9F 10392 bytes
SHA-256: abce3f518fc870d8ebaff95b32c04d539fad8e92d0c2693f8f86f26c956da96b
font_01_sfnt_off00006c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C9F 7000 bytes
SHA-256: 9d0b54792440258a236f660e63269ca4f0d7695f3c787af0d027f3431bed274c