Malicious PDF — malware analysis report

Static analysis result for SHA-256 923140b8a1685933…

MALICIOUS

PDF

34.0 KB Created: 2021-07-06 17:39:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 29c15158bd0f6e117e22dfeb591767b3 SHA-1: 15cef8f3bfae98061f1ebad45fa18fc45830a077 SHA-256: 923140b8a1685933933f4f18e3772516f3fc48fce19ac4272f382b3ca1dfa8d6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game hacks and Robux to entice users to click on malicious links. The primary link, http://netcdn.tw/app/431946152/free-robux-group-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering attack aimed at driving traffic to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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.tw/app/431946152/free-robux-group-game-hack In PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-hack-download_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/can-cheat-engine-hack-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-free-without-sign-in-no-download_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-spins-coin-master-links-thursday-november-28-2021_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/go-check-out-rob-lox-xyz-for-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-hack-roblox-scripts_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-glitch-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-hack-into-peoples-accounts-on-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/invisibility-hack-roblox-jaulbreak_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-hack-roblox-jailbreak-on-mobile_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/cool-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-real-hack_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-coin-master-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/castle-black-free-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/minecraft-hacks-list_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/best-tricks-co-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-unlimited-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3009 21900 bytes
SHA-256: cf75605b7a55094db54f047d00a8ef5175cb97010861750acc9335bf845753f9
font_01_sfnt_off00006050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6050 18892 bytes
SHA-256: 67507f51078b9d360364fd80bede771b0831b8cadce387b59c9348d966d9fcb5

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