Malicious PDF — malware analysis report

Static analysis result for SHA-256 591c83fe1491d804…

MALICIOUS

PDF

46.8 KB Created: 2021-06-09 04:38:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: fa158d11d2641fe70d98c26dbbb99083 SHA-1: 1499e305b18e501b25e91d8c8ddbb348019a3829 SHA-256: 591c83fe1491d80445efceb19488872d9186c4f4f0630142ca0e95270bfcc93a
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that are disguised as game hacks and free generators, a common lure for users. The primary URL, https://netcdn.tw/app/431946152/roblox-speed-hack-v3rmillion-game-hack, is directly linked to a heuristic firing for a game hack redirector. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a malicious intent to redirect users to potentially harmful sites for malware download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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 https://netcdn.tw/app/431946152/roblox-speed-hack-v3rmillion-game-hack PDF link annotation
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/minecraft-switch-free_GM479516143.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/free-fire-tik-tok_GM835599320.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/download-roblox-studio-20-free_GM431946152.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/roblox-hack-download-free-robux_GM431946152.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/robux-scam_GM431946152.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/roblox-2021-hack_GM431946152.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/mcpe-master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/robux-free-online_GM431946152.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/free-roblox-gear_GM431946152.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/scaffold-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/how-to-get-minecraft-bedrock-for-free-with-java_GM479516143.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_off00005289.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5289 27952 bytes
SHA-256: e305545033ac4871e8bc65e902a4260cc7eac07a45934a4324db049b09fa7733
font_01_sfnt_off000091ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91CE 19220 bytes
SHA-256: 518f7f99d2eb972eeeec7e69a0c76bda11a88b3c89028590d557e7d86b2807a9

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