Malicious PDF — malware analysis report

Static analysis result for SHA-256 e562d71e63d341b1…

MALICIOUS

PDF

44.5 KB Created: 2021-06-11 09:43:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9e25e59f959a5d3233c86cc57aa499ca SHA-1: e3e6940f54e36e8a6546e8c909ce0694f7648b02 SHA-256: e562d71e63d341b1d88e6169a8b418f6f81fd7228962d694552f88c179972de8
122 Risk Score

Malware Insights

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

The PDF document contains a high-confidence heuristic for a 'free generator / game hack' redirector, which is a common lure for malicious sites. The document body, though partially corrupted, contains text related to 'Robux Hack Download' and a URL that aligns with this theme. The presence of a fake CAPTCHA heuristic further supports the social engineering aspect of this attack, aiming to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/robux-hack-downlaod-game-hack PDF link annotation
    • http://elibrary.uniyap.ac.id/repository/hack-client-roblox-may-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/counter-blox-roblox-offensive-exploit-hacks-by-autumn_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-how-to-get-free-robux-2021-hacks-no-scam_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-studio-free-online_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/elts-hack-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/free-robux-without-phone-number_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-hack-tool-no-survey-no-download_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-hack-client-android_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/jailbreak-roblox-hack-mega_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-how-to-hack-filtering-enabled-games_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-robux-hack-console_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-hack-programm_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-players-for-free_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/free-german-uniform-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-surf-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/ad-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/robux-hack-download-pc-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/robux-hack-2021_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_004_off00004ee6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EE6 25240 bytes
SHA-256: d56719e50a5b57cf98f54710bacdd32e91bafc92a4447cdda35baf568e279033
font_01_sfnt_off00008981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8981 18828 bytes
SHA-256: 4283c3d843d72327d518de196a6c5c675dd0801a548e449e8ff9a3b3f0bd3750

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