Malicious PDF — malware analysis report

Static analysis result for SHA-256 148312859613431e…

MALICIOUS

PDF

42.0 KB Created: 2021-05-12 00:05:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3d642753943e8160d2f4b6863e0c5ddc SHA-1: 6b9b7de3e42c860d3d5330c43875a28a0b92da76 SHA-256: 148312859613431e6fac9f0a0a6e977c0f97b33489c0984230295bbb26129e06
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game currency and hacks to entice users. It contains multiple embedded URLs, including a primary malicious redirector at https://netcdn.xyz/app/406889139/free-spins-on-coin-master-link-game-hack. The document's structure and embedded links strongly suggest a phishing or scam campaign aimed at redirecting users to potentially malicious sites. No scripts were extracted, but the PDF's nature points towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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.xyz/app/406889139/free-spins-on-coin-master-link-game-hack In PDF document text
    • http://library.futureuniversity.com/repository/link-for-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-hair-roblox-boy_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-free-spins-ios-2021_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-500-free-spins_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-hack-without-human-verification-india_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-mast-hacks_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-links-for-today_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-daily-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-spin-link-of-coin-master_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/100-free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/roblox-free-executor_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/roblox-com-free_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/roblox-free-items-glitch_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-executors-for-roblox_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
stream_003_off00004a3b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A3B 25012 bytes
SHA-256: 99e3890be722f201edb67fe3101e93b2619cdb0ed85b8f5938a7d5e938b328d3
font_01_sfnt_off000082a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82A1 18056 bytes
SHA-256: 892ebf3b86ae534fd3f474e2c239da2a9bb4dc91f8225dc09222a78aadec1336

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