Malicious PDF — malware analysis report

Static analysis result for SHA-256 36cb64eb2dd57f1d…

MALICIOUS

PDF

35.0 KB Created: 2021-07-04 08:14:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 274f0f21d24f3e4ac18aaeeefa4b4801 SHA-1: edeecf32ab4b266cbe87f44c797fe285b4b9a66c SHA-256: 36cb64eb2dd57f1dc01a5c6bc752516da018f5879aa60bd686baca2680e978b2
160 Risk Score

Malware Insights

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

The PDF document contains multiple links, including one to a known malicious redirector, that lure users into believing they can get free game currency or hacks. The ML classifier strongly flagged this PDF as malicious. The embedded URLs likely lead to further malicious content or phishing pages, potentially exploiting vulnerabilities within the PDF reader.

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/406889139/get-free-spins-coin-master-2021-game-hack In PDF document text
    • https://daquagro.id/assets/vendor/ckfinder/userfiles/files/earn-robux-sites_GM431946152.pdfIn PDF document text
    • https://daquagro.id/assets/vendor/ckfinder/userfiles/files/how-to-hack-roblox-project-pokemon_GM431946152.pdfIn PDF document text
    • https://daquagro.id/assets/vendor/ckfinder/userfiles/files/como-conseguir-robux-gratis-100-real-sin-hacks_GM431946152.pdfIn PDF document text
    • https://daquagro.id/assets/vendor/ckfinder/userfiles/files/free-robux-new-logo-roblox_GM431946152.pdfIn PDF document text
    • https://daquagro.id/assets/vendor/ckfinder/userfiles/files/real-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://daquagro.id/assets/vendor/ckfinder/userfiles/files/spin-and-coin-link_GM406889139.pdfIn PDF document text
    • https://daquagro.id/assets/vendor/ckfinder/userfiles/files/roblox-rewards-robux_GM431946152.pdfIn PDF document text
    • https://daquagro.id/assets/vendor/ckfinder/userfiles/files/roblox-hack-game_GM431946152.pdfIn PDF document text
    • https://daquagro.id/assets/vendor/ckfinder/userfiles/files/roblox-18_GM431946152.pdfIn PDF document text
    • https://daquagro.id/assets/vendor/ckfinder/userfiles/files/how-to-hack-gamepasses-on-roblox_GM431946152.pdfIn PDF document text
    • https://daquagro.id/assets/vendor/ckfinder/userfiles/files/lifting-simulator-hack-roblox_GM431946152.pdfIn PDF document text
    • https://daquagro.id/assets/vendor/ckfinder/userfiles/files/free-minecraft-hosting_GM479516143.pdfIn PDF document text
    • https://daquagro.id/assets/vendor/ckfinder/userfiles/files/roblox-play-for-free-robux_GM431946152.pdfIn PDF document text
    • https://daquagro.id/assets/vendor/ckfinder/userfiles/files/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • https://daquagro.id/assets/vendor/ckfinder/userfiles/files/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://daquagro.id/assets/vendor/ckfinder/userfiles/files/best-hacked-client_GM479516143.pdfIn PDF document text
    • https://daquagro.id/assets/vendor/ckfinder/userfiles/files/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • https://daquagro.id/assets/vendor/ckfinder/userfiles/files/how-to-get-free-skins-on-roblox_GM431946152.pdfIn PDF document text
    • https://daquagro.id/assets/vendor/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://daquagro.id/assets/vendor/ckfinder/userfiles/files/v3rmillion-hacks-roblox_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_002_off00003265.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3265 22792 bytes
SHA-256: a69f9145c8d712b747ade78f98a3cb4c000d805e4121783cc70cd7646a953c03
font_01_sfnt_off00006559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6559 18576 bytes
SHA-256: 47068641d4cd5afad495b2744cbb78709b2a1d88425159384b1e35df59296f67

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