Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f3c8b11651ce52…

MALICIOUS

PDF

34.2 KB Created: 2021-07-04 09:04:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6606b3daff2bb31e6b61d4b31a84e64f SHA-1: 1211a9f5eacde926ccc895ae91d20f0f24a2a9a1 SHA-256: 99f3c8b11651ce52ff9e32634f0386b4db8df681eee62f6f4fe1944a94f325f1
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. 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 0.9980

Heuristics 4

  • 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.
  • 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.tw/app/431946152/blox-world-free-robux-game-hack PDF link annotation
    • http://lib.fekon.untad.ac.id/repository/free-robux-and-tix-generator-2021_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-com_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/roblox-walk-through-walls-hack-no-cheat-engine_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-free-daily-rewards_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-black-widow-sword-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/roblox-lucky-block-battlegrounds-cheats_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-kak-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-get-free-robux-nota-hack_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-get-free-john-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/wurst-115_GM479516143.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/twitter-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-robux-redeem-cards-2021_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-spins-coin-master-march-2021_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-get-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/roblox-royale-high-cheats_GM431946152.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
font_00_sfnt_off00002e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E76 22320 bytes
SHA-256: 3fe37c53d251fed26faace546a387ba5aba0df63d60ca66c98ecd4e1ebc45cb2
font_01_sfnt_off00006017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6017 19160 bytes
SHA-256: 42e554ef2c91bbb5af350d4b1f45d0a0f829397bc38bc7c2009f5bdaf8074c39

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