Malicious PDF — malware analysis report

Static analysis result for SHA-256 430b0c9a0cc3de60…

MALICIOUS

PDF

30.5 KB Created: 2018-06-11 09:45:19 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-04
MD5: ade8202d0d774bf1b6892489c7ebb494 SHA-1: 8b85a8d8b16f0848c69c692a4fd7f8f462c84ee1 SHA-256: 430b0c9a0cc3de6015d023dc88070b3164dec6a0094833b3b41b08aa47b05dc6
130 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains embedded URLs that mimic search result links, specifically for a book titled 'the clue of broken locket nancy drew 11 carolyn keene'. The primary URL, http://uncpbisdegree.com/download3.php?q=the-clue-of-broken-locket-nancy-drew-11-carolyn-keene.pdf, is flagged as suspicious and likely serves as a lure for a malicious download. The ML classifier also flagged this PDF as malicious with a high probability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9525

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-clue-of-broken-locket-nancy-drew-11-carolyn-keene.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=the-clue-of-broken-locket-nancy-drew-11-carolyn-keene.pdfIn PDF document text
    • http://www.nancydrewsleuth.com/mysterystories.htmlIn PDF document text
    • http://www.ndsleuths.com/ndsconventions.htmlIn PDF document text
    • http://riverside-resort.net/1/the-teachers-funeral.pdfIn PDF document text
    • http://riverside-resort.net/1/switzerland-2015-michelin-national-map-729-michelin-national-maps.pdfIn PDF document text
    • http://riverside-resort.net/1/the-foundations-of-common-sense.pdfIn PDF document text
    • http://riverside-resort.net/1/title-microeconomics-8th-edition-author-robert-pindyck.pdfIn PDF document text
    • http://riverside-resort.net/1/un-deux-trois-dual-language-french-english-first-french-rhymes-book-cd.pdfIn PDF document text
    • http://riverside-resort.net/1/the-complete-idiot-s-guide-to-fermenting-foods.pdfIn PDF document text
    • http://riverside-resort.net/1/stonewolf-teacher-apos-s-edition.pdfIn PDF document text
    • http://riverside-resort.net/1/the-last-light-of-the-sun.pdfIn PDF document text
    • http://riverside-resort.net/1/solution-of-macroeconomics-theories-and-policies-froyen.pdfIn PDF document text
    • http://riverside-resort.net/1/theories-of-general-education-a-critical-approach.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/Carolyn_KeeneIn PDF document text
    • https://en.wikipedia.org/wiki/Nancy_DrewIn PDF document text
    • https://sv.wikipedia.org/wiki/Kitty_DrewIn PDF document text
    • http://www.microsofttranslator.com/bv.aspx?ref=SERP&br=ro&mkt=en-US&dl=en&lp=SV_EN&a=https%3a%2f%2fsv.wikipedia.org%2fwiki%2fKitty_DrewIn PDF document text
    • https://fr.wikipedia.org/wiki/Alice_RoyIn PDF document text
    • http://www.microsofttranslator.com/bv.aspx?ref=SERP&br=ro&mkt=en-US&dl=en&lp=FR_EN&a=https%3a%2f%2ffr.wikipedia.org%2fwiki%2fAlice_RoyIn PDF document text
    • https://y.qq.com/In PDF document text
    • http://www.microsofttranslator.com/bv.aspx?ref=SERP&br=ro&mkt=en-US&dl=en&lp=ZH-CHS_EN&a=https%3a%2f%2fy.qq.com%2fIn 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_off00003d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3D0D 10316 bytes
SHA-256: a1053183c8bc5c0b2d8138f34deec897a210b13c1b13a22c96467c94ae8770b5
font_01_sfnt_off00005def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DEF 6936 bytes
SHA-256: 1c2237e63d2193a6a661126d27bd1f011297a189586cc727c83de588c209f3c4