Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb95c4ec84805cda…

MALICIOUS

PDF

45.8 KB Created: 2021-06-11 02:33:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: faf86b62a56d1bc5a05f50ddc52a609b SHA-1: fcbeb7dbcb7539b655be16886b7c77ffce1a0395 SHA-256: fb95c4ec84805cdaa864fb34a199f3e9b0c3f17fdd996543b6939a6250791fca
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to game hacks and generators, specifically mentioning 'Roblox Hack 2021' and 'free robux codes'. It contains numerous embedded URLs that likely lead to malicious content or further infection vectors. The ML classifier strongly indicated maliciousness, and the PDF_GAME_HACK_REDIRECT_LURE heuristic confirms the use of a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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-hack-2021-legit-yt-game-hack PDF link annotation
    • http://www.library.gkigadingserpong.org/repository/coin-master-hack-apk-app_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/pubg-uc-mod-2021_GM1330123889.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-minecraft-shaders_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-minecraft-java-code_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-minecraft-bedrock-for-free-with-java_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/do-any-roblox-hacks-work_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/download-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/minecraft-free-download-ipad_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-minecraft-bedrock-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/krnl-download_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/hey-google-how-do-you-get-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_004_off000051de.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51DE 25608 bytes
SHA-256: b3ef978a0afedca483f022ed74d425a9ccdd807c6e84607f8bd21b9cccd514ea
font_01_sfnt_off00008d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D83 19256 bytes
SHA-256: f5c7a25e072a91bf111c8aae033e4491b74a83e5984c72144d7c06639ad11334

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