Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5ab5f62e08674c…

MALICIOUS

PDF

48.2 KB Created: 2021-06-03 06:27:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 370c349fd0bf5f947559491bb7de46d1 SHA-1: 6cb4c9d3b498d0e128097f96280bc894b1b013e1 SHA-256: ff5ab5f62e08674c7a1af8d178efefecb859ef00eb61b841f831296fc243ed74
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure and a fake-CAPTCHA lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.online/app/431946152/free-roblox-clothes-codes-game-hack PDF link annotation
    • http://digilib.stimlog.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-free-spins-link-2021-twitter_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-make-your-own-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-real-free-spins_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-100-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-coin-master-game_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/robux-free-c_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-cheats_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/minecraft-pvp-hacks_GM479516143.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-minecraft-codes_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-minecraft-games-for-kids_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/ear-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-diamond-finder-hack_GM479516143.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_off00004f65.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F65 26588 bytes
SHA-256: 2ff39b6ce39403b84dbfdaf1538c2d4cb146055ff049c802156f765739a450da
font_01_sfnt_off00008c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C6B 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off0000997d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x997D 18392 bytes
SHA-256: 8f170c24a43a5cea343fe8e0c347968302273409877848d607eb86d714eb009a

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