Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfdca868845af152…

MALICIOUS

PDF

34.8 KB Created: 2021-07-02 07:40:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8f6f11e7022dadd05e43efa3611cad57 SHA-1: 3dc19847cb76c65ce64170e0d1683e5b2eca52b2 SHA-256: dfdca868845af1520a1f62d1e776be6d0b2272905f24183325784d883f400a10
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document employs a game hack lure, specifically mentioning 'Robux Free Promo Codes', to entice users. It contains a high-risk external URI pointing to 'http://netcdn.co/app/431946152/robux-free-promo-codes-game-hack', which is likely a landing page for malware or a phishing scam. The presence of a 'password-protected archive handoff' heuristic suggests the user might be instructed to download an encrypted file, a common tactic to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://netcdn.co/app/431946152/robux-free-promo-codes-game-hack PDF link annotation
    • http://library.ulb.ac.id//repository/earn-points-for-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/cheat-granny-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/all-roblox-games-for-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/minecraft-free-minecraft_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-items-in-roblox-live_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/comment-hacks-roblox-2021-download_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-wikipedia-free-encyclopedia_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/games-with-free-segway-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/best-site-for-free-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/minecraft-java-edition-key-free_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-free-terminated-accounts-passwords-and-logins_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-hacks-for-iphone_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/minecraft-free-install_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-roblox-noob-accounts_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/cheat-roblox-jailbreak-tembus_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/le-jeux-du-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/aimbot-download-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-no-downloads-no-surveys_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-spins-and-coins-com_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_002_off00002f3e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F3E 22812 bytes
SHA-256: b183fb10389ee594105e086567aa895ded1dccf6a93b20a373bb36c267cfe5a5
font_01_sfnt_off00006245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6245 19304 bytes
SHA-256: c1af96096ee4fe66b31908d73526086302c421ddc21d11abc86e2e14451b0c0a

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