Malicious PDF — malware analysis report

Static analysis result for SHA-256 1accf9f2c3ac2d9c…

MALICIOUS

PDF

48.8 KB Created: 2018-06-11 09:11:15 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 1b615ac53e73bdf3437278d8d83a5a62 SHA-1: 0691d02dbe7eb79cf443cf71fd343febd9af1d01 SHA-256: 1accf9f2c3ac2d9c6c91989d23624d7d78f3e714bcca42d06252af8ce2d34380
130 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that point to suspicious download locations, suggesting it is a lure for downloading a malicious payload. The ML classifier also flagged this PDF as malicious. The document body and heuristics indicate a social engineering attempt to trick the user into downloading a file disguised as 'cheats' for a business simulation, which is a common tactic for distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6445

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=virtual-business-knowledge-matters-cheats.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=virtual-business-knowledge-matters-cheats.pdfIn PDF document text
    • https://knowledgematters.com/blog/virtual-business-challenge-hintsIn PDF document text
    • https://knowledgematters.com/In PDF document text
    • https://knowledgematters.com/highschoolIn PDF document text
    • https://knowledgematters.com/collegeIn PDF document text
    • https://knowledgematters.com/highschool/personal-financeIn PDF document text
    • https://knowledgematters.com/highschool/competitions/decaIn PDF document text
    • https://knowledgematters.com/blogIn PDF document text
    • https://knowledgematters.com/about/pressIn PDF document text
    • http://vsitours.com/virtual-business-knowledge-matters-cheats/In PDF document text
    • http://pdfsdirpp.com/download/knowledge-matters-virtual-business-cheats.pdfIn PDF document text
    • http://toweko.de/knowledge/matters/knowledge_matters_virtual_business_cheats.pdfIn PDF document text
    • http://xdanek.de/knowledge/matters/knowledge_matters_virtual_business_cheats.pdfIn PDF document text
    • http://cnclan.de/knowledge/matters/knowledge_matters_virtual_business_personal_finance_cheats.pdfIn PDF document text
    • http://uncpbisdegree.com/1/world-of-insects-word-search-answers-key.pdfIn PDF document text
    • http://uncpbisdegree.com/1/wiper-relay-wiring-mazda-626.pdfIn PDF document text
    • http://uncpbisdegree.com/1/world-of-business-5th-edition-answers.pdfIn PDF document text
    • http://uncpbisdegree.com/1/top-computer-science-journals.pdfIn PDF document text
    • http://uncpbisdegree.com/1/uscis-citizenship-100-questions-answers.pdfIn PDF document text
    • http://uncpbisdegree.com/1/vista-practice-management.pdfIn PDF document text
    • http://uncpbisdegree.com/1/travelling-hopefully.pdfIn PDF document text
    • http://uncpbisdegree.com/1/walmart-price-match-after-purchase.pdfIn PDF document text
    • http://uncpbisdegree.com/1/what-were-the-top-5-causes-of-the-civil-war.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-narrowboat-lad.pdfIn PDF document text
    • https://knowledgematters.comIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://www.youtube.com/watch?v=BUQbwxWMmgoIn 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_off0000708d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x708D 14708 bytes
SHA-256: 20cd37eb19c5e8d8134d8b98db8092df79749e84a45a48487f8c8ff25c1d04ae
font_01_sfnt_off00009d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D9A 8888 bytes
SHA-256: 97ceab9a1828338d6163be2f52e1c55665b25b74cb49651c99a9393ee2ba68a0