Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d73fd99650c5f9…

MALICIOUS

PDF

46.7 KB Created: 2021-06-03 18:24:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 7fbe92b4974223d6faa316fb378184cb SHA-1: 0ebd6d2acb714882df29fea7d5c2fbee05a2954d SHA-256: 90d73fd99650c5f9fab8b4ddc30cf24f786d684a45b8dbadd50d542b91f1a4aa
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors, specifically advertising free game hacks and generators. The primary lure URL is https://netcdn.online/app/479516143/minecraft-free-ios-game-hack, which is designed to trick users into downloading potentially unwanted or malicious software. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.online/app/479516143/minecraft-free-ios-game-hack In PDF document text
    • https://www.wcauk.org/uploads/files/files/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-tiktok-followers-instantly_GM835599320.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/pubg-uc-redeem-code-2021_GM1330123889.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/online-coin-master-free-spin-app_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-coin-master-gift-link_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/robux-2021_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/roblox-hacked-com-2021_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/get-free-robux-today_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/roblox-free-pants_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-game-packs-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/coin-master-free-spins-and-coins-without-human-verification_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/can-you-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-minecraft-alts_GM479516143.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/roblox-free-robux-no-human-verification_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_off0000532e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x532E 33812 bytes
SHA-256: 69d6fba00a414d710fe154ff8d7830565532b44f4bbef3b695b88f798fc85a78
font_01_sfnt_off0000960b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x960B 17712 bytes
SHA-256: 54d91aee1a0896e30cfb652b9b9fc91e7951cfaa65da7a48657c461bc2dd637d

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