Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f06bb6ebae9dad…

MALICIOUS

PDF

49.7 KB Created: 2021-06-10 11:26:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: dcf1125885a9f3b8404532317df46e3a SHA-1: ad5e7e44f8d750067647849f91d70d0959343169 SHA-256: 21f06bb6ebae9dadfa0d1af90ace533717be5bfb4563e315ddee1af48e4c3c7b
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a prominent link and text related to 'free Robux' and 'game hacks', indicating a lure for potentially malicious content or scams. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing or scam attempt, likely leading to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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) 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/free-robux-without-human-verification-or-survey-or-offers-2021-game-hack PDF link annotation
    • http://digilib.pustaka.unand.ac.id/repository/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/cheat-engine-63-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/how-to-get-free-roblox-hair_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/robloxedit-avaater-cheatcom_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/free-tiktok-likes-no-survey_GM835599320.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/roblox-prison-life-gui-hacks-pastebin_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/roblox-catalog-free-2021_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/nonsei-diamond-hack-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/minecraft-windows-10-free-code_GM479516143.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/op-rewards-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/every-free-item-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005206.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5206 26644 bytes
SHA-256: 2907e4b359c10de1b6f83e62524ba7a764d4ffa53c7e1fc5b7a55335fccb399e
font_01_sfnt_off00008e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E2A 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00009ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AD2 19920 bytes
SHA-256: 59a231d66a754bc4408b44930a9dd05a62d995bc5454e55b80dc1bb13a4434ac

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