Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbfcb5c1f93e79f5…

MALICIOUS

PDF

34.5 KB Created: 2021-06-26 00:26:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: dc61357188f6778b53eed9fea8008446 SHA-1: 7412496079d8828245ebe386e5309d57bee7034f SHA-256: dbfcb5c1f93e79f583c7d4eda09cdb0399cc1eb71b5e6d2afa8121f217fc42b1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free in-game currency for popular games like Roblox and Coin Master, as indicated by the document body and multiple heuristic firings. It contains numerous embedded URLs that point to redirectors and potentially malicious content, with a primary redirector identified at http://netcdn.co/app/431946152/how-to-get-free-gear-in-roblox-2021-game-hack. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/how-to-get-free-gear-in-roblox-2021-game-hack In PDF document text
    • http://elibrary.perludem.org//repository/coin-master-hack-tool-without-human-verification_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/robux-hacks-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/denisdaily-exposing-a-roblox-hacker-wild-revolvers_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-today_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-bux-cheats_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/pubg-uc-20219_GM1330123889.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/7-year-old-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-sign-in-free_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/how-to-get-coin-master-free-spins-in-email_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-free-chest-link_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-in-1-sec_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-restaurant-tycoon-diamond-hack-script_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/como-hackear-cuentas-de-roblox-facil-y-rapido_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/tiktok-free-install_GM835599320.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/worst-client_GM479516143.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_002_off00002eaa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2EAA 22540 bytes
SHA-256: f554b99111013439936d4640f7367ed7b8b8e651d9cbf0628c651bc6d560a572
font_01_sfnt_off000060f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60F5 19320 bytes
SHA-256: 0e8fa20d759c6d3bfad81b470c9a01331883d5e462e086eac595039043d630b2

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