Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc273290e284695…

MALICIOUS

PDF

34.4 KB Created: 2021-06-25 04:23:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 839fa8aee43fc396dea18efce47b1da2 SHA-1: b66e1d0b4fc9e2b6ab11f15a4570e71f6057666e SHA-256: 4cc273290e284695069f1ebc5e0fb737359cad4a178eee6b299c8298480e97bd
168 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains embedded JavaScript and links to a known malicious redirector. The lure content suggests a scam related to 'free Robux' or 'game hacks', likely intended to trick users into downloading further malware or visiting phishing sites. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities within the PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://netcdn.co/app/431946152/free-robux-robux-boost-game-hack In PDF document text
    • https://sundae.co.th/js/userfiles/files/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/javascript-free-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/spins-coin-master_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-spins-free-2021_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/roblox-script-hack_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-edit-html_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-free-raid-link_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/freespinandcoin-blogspot_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/roblox-free-no-download_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-free-spins-2021-ios_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-hack-working_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/roblox-private-server-free-download_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-printable-roblox-coloring-pages_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/easy-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000315c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x315C 22096 bytes
SHA-256: 9d7b5082de42ebef8d2e01506e84205137c8009fc913e0b8f6585c54f69f3f64
font_01_sfnt_off00006222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6222 18820 bytes
SHA-256: 38c24072e2b2e3cae40dd758c502479d774870cd1bfb2840e484984014364642

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