Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1af62e7a0db653…

MALICIOUS

PDF

43.7 KB Created: 2021-06-09 08:55:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0e5405a54b250574e47e3ff6f868f3b5 SHA-1: fa30578b30297109c219918407b6f118c83b0151 SHA-256: ab1af62e7a0db653a35aa28810e04f18f5264812207c16cc78ece6f1bf878ad3
160 Risk Score

Malware Insights

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

The PDF contains multiple links to redirector domains, specifically advertising game hacks and free in-game currency, which is a common lure for phishing and malware distribution. The ML classifier also flagged this PDF as malicious. The primary redirector URL is https://netcdn.tw/app/431946152/roblox-build-a-boat-hack-nopde-game-hack, which likely serves as a gateway to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.tw/app/431946152/roblox-build-a-boat-hack-nopde-game-hack In PDF document text
    • http://mbbs.hr/files/coin-master-email-rewards_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/corn-master_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/roblox-skins-boy-free_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/play-roblox-free-online_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-card-hack-2021_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/roblox-dbz-super-saiyan-war-hack_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-legally-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/minecraft-education-free_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/tiktok-free-skin-ml_GM835599320.pdfIn PDF document text
    • https://mbbs.hr/files/claim-robux_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-hack-apk-no-survey_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/free-roebucks_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-bedrock-minecraft_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/freespinandcoinblogspotcom-2021-11-coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-admin-free-spins_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-spins-11-01-2021_GM406889139.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_off00004f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F23 24120 bytes
SHA-256: b4485c3f08a01095f109aeda190b6ceb4d45a2994dda196340e706964f0f22d5
font_01_sfnt_off00008645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8645 18896 bytes
SHA-256: 5c5567e26fbbffa68b7d92c9393062cbe758cb21b512f57656970ac16fcd2234

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