Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4587fc079837e8…

MALICIOUS

PDF

44.3 KB Created: 2021-05-13 10:43:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 38f4e83cd965d580368c301378964655 SHA-1: aa34c81ffb4190427f0ae894cef3627351315277 SHA-256: 8d4587fc079837e89e1ddf530ac7a7704985e534afb38f7b8abc2bb54580bb6e
122 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, directing users to a URL promising free game currency or hacks. This is a common tactic to trick users into visiting malicious websites or downloading further malware. The ML classifier strongly indicated maliciousness, and the embedded URLs suggest a phishing or exploit delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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
  • 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.xyz/app/431946152/how-to-get-free-robux-without-verification-or-surveys-game-hack PDF link annotation
    • https://www.interiormurahjogja.com/ckfinder/userfiles/files/free-back-accessories-roblox_GM431946152.pdfIn PDF document text
    • https://www.interiormurahjogja.com/ckfinder/userfiles/files/try-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.interiormurahjogja.com/ckfinder/userfiles/files/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • https://www.interiormurahjogja.com/ckfinder/userfiles/files/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.interiormurahjogja.com/ckfinder/userfiles/files/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://www.interiormurahjogja.com/ckfinder/userfiles/files/how-to-get-free-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.interiormurahjogja.com/ckfinder/userfiles/files/how-to-make-a-minecraft-java-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.interiormurahjogja.com/ckfinder/userfiles/files/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.interiormurahjogja.com/ckfinder/userfiles/files/coin-master-hacks-for-spins_GM406889139.pdfIn PDF document text
    • https://www.interiormurahjogja.com/ckfinder/userfiles/files/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.interiormurahjogja.com/ckfinder/userfiles/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.interiormurahjogja.com/ckfinder/userfiles/files/minecraft-realms-free-codes_GM479516143.pdfIn PDF document text
    • https://www.interiormurahjogja.com/ckfinder/userfiles/files/coun-master_GM406889139.pdfIn PDF document text
    • https://www.interiormurahjogja.com/ckfinder/userfiles/files/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://www.interiormurahjogja.com/ckfinder/userfiles/files/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.interiormurahjogja.com/ckfinder/userfiles/files/robux-free-online_GM431946152.pdfIn PDF document text
    • https://www.interiormurahjogja.com/ckfinder/userfiles/files/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.interiormurahjogja.com/ckfinder/userfiles/files/free-arsenal-hacks_GM431946152.pdfIn PDF document text
    • https://www.interiormurahjogja.com/ckfinder/userfiles/files/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • https://www.interiormurahjogja.com/ckfinder/userfiles/files/roblox-fun-com-free-robux_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
stream_003_off00004e16.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E16 24944 bytes
SHA-256: ef21cee07ce1f8507dc1e61f4c00cbda1c1e3b48ebd65feb13e1114712a5a59e
font_01_sfnt_off00008791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8791 19424 bytes
SHA-256: 30551668946d9b3d80fdd5a427c07e5f2c52faec585ae3c44dbbbd4d67cc7463

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