Malicious PDF — malware analysis report

Static analysis result for SHA-256 736d8ad98ad52664…

MALICIOUS

PDF

45.6 KB Created: 2021-06-11 06:56:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b2047c1830eff6844c2f313bc46e0023 SHA-1: c9472d12da4dd1cbccc39183dd859c86915ee557 SHA-256: 736d8ad98ad52664dd2f5315ef361876b6920f9a9ce3c3abaf9d6daac4d5185f
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector domains and explicitly requests recovery secrets, indicating a phishing or scam attempt. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the embedded URLs and the nature of the lure strongly suggest a malicious intent to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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/arcane-adventures-roblox-free-game-hack In PDF document text
    • http://library.futureuniversity.com/repository/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-mod-apk-free-download-for-android_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/robuxmatch-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/roblox-hacks-lua-commands_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/give-me-robux-now_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-hack-without-verification-for-iphone_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/fb-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-robux-safe_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/spins-gratis-coin-master-hoy_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-robux-games-that-work-2021_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_off000051ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51AE 25928 bytes
SHA-256: a83dae9715bbc912541cee2db25248a87b475a54fd234252da92a96a4c80d7f9
font_01_sfnt_off00008e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E25 18708 bytes
SHA-256: badeef2b220a604a73e37b56fbda69f50ad00565a6f81c7c3f9a774ed119b5ad

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