Malicious PDF — malware analysis report

Static analysis result for SHA-256 24beddbb585572bc…

MALICIOUS

PDF

35.2 KB Created: 2021-07-09 09:26:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: cf90c9f7f75cf6736eac888f6b6b600a SHA-1: 79d628ee14fa3b2678dfb14e2fc2662568e08f19 SHA-256: 24beddbb585572bcdaa0b0f525e23953676bdf03bde9b4b2d6a0585509eaec04
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a game hack redirect lure, pointing to a URL that is also flagged as malicious. The document body and embedded URLs reinforce this lure by mentioning 'free Robux' and 'game hack'. While no scripts were extracted, the primary attack pattern involves redirecting the user to malicious infrastructure via a deceptive link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/how-to-earn-robux-for-free-2021-game-hack In PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/how-to-hack-coin-master-in-pc_GM406889139.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/jump-hack-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/game-give-free-robux_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/roblox-updated-hack-com_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/minecraft-apk-download-free-11-055_GM479516143.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/how-long-are-you-banned-from-roblox-if-you-hack_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/roblox-best-hack-clients-virus-free_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/how-to-make-free-roblox-audio_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/roblox-cheat-engine-shut-down_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/give-free-robux_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/roblox-skybox-changer-hack_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/roblox-pokemon-brick-bronze-hack-legendary_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/free-spins-coin-master-links-app_GM406889139.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/robux-hack-2021-without-human-verification_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/err-face-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/brady2021-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/free-roblox-accounts-with-robux-that-work-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
font_00_sfnt_off00003148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3148 22524 bytes
SHA-256: 23173b83d884cf59a770930fd045c2c0cf72c8870f66712f3ba00c33c6ae6399
font_01_sfnt_off000063a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63A1 19284 bytes
SHA-256: b399ae733d7917559aeb38653f56690fc8d0842846df9d5376906f0eed96920f

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