Malicious PDF — malware analysis report

Static analysis result for SHA-256 5196375612db452c…

MALICIOUS

PDF

34.6 KB Created: 2018-06-11 09:11:12 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-08-25
MD5: 192543bb385a4799ba7f28e7f0867ac5 SHA-1: f4e7ec78840f9bbb5ab9d6f48b4e276dd639fe0f SHA-256: 5196375612db452c6c1ffdf5a32a509f35889658713e6e224b97bed259430ae0
130 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF document was flagged by an ML classifier as malicious. It contains an embedded URI pointing to 'uncpbisdegree.com/download3.php', which is likely a lure to download a secondary payload. The presence of a visual download button heuristic further supports this attack pattern. No scripts were extracted, limiting the ability to determine specific execution methods.

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=the-job-pirate-an-entertaining-tale-of-my-job-hopping-journey-in-america.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=the-job-pirate-an-entertaining-tale-of-my-job-hopping-journey-in-america.pdfIn PDF document text
    • https://www.wheeloffortunecheats.com/event/In PDF document text
    • http://www.usna63.org/tradition/In PDF document text
    • http://www.readkiddoread.com/great-illustrated-books/storybooksIn PDF document text
    • https://wheeloffortuneanswer.com/event/In PDF document text
    • http://www.kidsfirst.org/ages/2-5.htmlIn PDF document text
    • http://ralphus.net/archives/gimp2014/mar14.htmlIn PDF document text
    • http://themeparkpress.com/In PDF document text
    • https://www.backstreets.com/setlists.htmlIn PDF document text
    • http://366weirdmovies.com/the-weird-movie-list/In PDF document text
    • http://www.thelastexit.net/cinema/other.htmlIn PDF document text
    • http://thelastexit.net/cinema/main.htmlIn PDF document text
    • http://www.bdsmlibrary.com/stories/wholestory.php?storyid=3464In PDF document text
    • http://www.videoscreams.com/CONSOLIDATEDIn PDF document text
    • http://brewersguild.org.nz/newsIn PDF document text
    • http://just-a-minute.info/subjects.htmlIn PDF document text
    • http://www.oldmovieexhibition.com/In PDF document text
    • http://www.lovethesepics.com/2011/05/creepy-crusty-crumbling-illegal-tour-of-abandoned-six-flags-new-orleans-75-pics/In PDF document text
    • http://uncpbisdegree.com/1/the-flaw-of-averages-why-we-underestimate-risk-in-the-face-of-uncertainty.pdfIn PDF document text
    • http://uncpbisdegree.com/1/solutions-brother.pdfIn PDF document text
    • http://riverside-resort.net/1/volkswagen-tiguan-repair-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/workbook-of-fce.pdfIn PDF document text
    • http://riverside-resort.net/1/yokai-attack-the-japanese-monster-survival-guide-hiroko-yoda.pdfIn PDF document text
    • http://uncpbisdegree.com/1/ssc-exam-suggestion-2018.pdfIn PDF document text
    • http://riverside-resort.net/1/unlock-code-for-blackberry-bold-9900.pdfIn PDF document text
    • http://riverside-resort.net/1/wilson-4jr-manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/symbol-for-male-fetal-pig.pdfIn PDF document text
    • http://uncpbisdegree.com/1/sony-pcv-rx790g-desktops-owners-manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://www.hollywoodreporter.com/In PDF document text
    • https://www.fanfiction.net/u/2313539/Tactition101In PDF document text
    • https://www.telegraph.co.uk/news/In PDF document text
    • https://www.fanfiction.net/u/3621135/Chooch77In PDF document text
    • http://tvtropes.org/pmwiki/pmwiki.php/Main/TroperifficIn PDF document text
    • http://tvtropes.org/pmwiki/pmwiki.php/Main/FinalSpeechIn PDF document text
    • http://www.gutenberg.org/files/74/74-h/74-h.htmIn 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_off00004b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B37 10276 bytes
SHA-256: 8156b4e72b32c166438f5b1054498faa4b4dbe827e3af09abc74843d254bd201
font_01_sfnt_off00006bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BFA 7232 bytes
SHA-256: 52117340bd5a6481f93906bf02bc5a03cf65f8524a8de52573282c4b76b5c5f6