Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4838c1f0b5ea896…

MALICIOUS

PDF

44.3 KB Created: 2021-06-10 18:44:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 45700d9497b9455fc90e068eca5f06c1 SHA-1: bd108ed40f1c9746f39d1a109c9e204df6d276b9 SHA-256: a4838c1f0b5ea89688a0990eee46b57325cebfe30d29a5312756830d5bca9202
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains links to known malicious redirectors and lures users with promises of game hacks and generators, specifically mentioning Roblox. The document body, though heavily obfuscated, contains URLs that are likely part of a phishing or malware distribution chain. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent.

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-download-android-free-game-hack In PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-grand-blox-auto-money-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-free-items-on-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/100-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-extra-spins_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/make-your-own-minecraft-server-free_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-game-hack-version-download_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/is-roblox-free-on-nintendo-switch_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-complete-offers_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/hacken-on-roblox-hin-zuuzu_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/robloxhacks_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-daily-gifts_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-jjsploit-money-hack-any-game_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/speed-hack-roblox-jailbreak-cheat-engine_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/cm-spin-link_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/claimrobux-net_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-hack-ghots-simulator_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-20-free-spins-link-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
stream_004_off0000510a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x510A 24432 bytes
SHA-256: 8a336bc32144706a57400454fa62a2e741de0e720972e9f2abc8421c620404a4
font_01_sfnt_off00008912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8912 18804 bytes
SHA-256: 2e8356f366db8f2666cc7c05484bc34f2561bfc95c5ebd065685abb2fba5818c

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