Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef21801689a4ac4c…

MALICIOUS

PDF

44.9 KB Created: 2021-06-10 14:10:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f252583fcfd164a51660d1844492279a SHA-1: 2254b46f70eed442e77f36e8702fda3e5a899d1e SHA-256: ef21801689a4ac4cd3dd4670a3d25519ee76fb337f300ea0e135eeb9d5bcceb2
82 Risk Score

Malware Insights

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

This PDF document contains a lure for game hacks, specifically targeting Roblox and Minecraft, directing users to external URLs. The ML classifier strongly indicated maliciousness, and the embedded URLs suggest a redirection to potentially malicious content or phishing pages. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a social engineering attack to trick users into downloading further malware or divulging information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/app-for-hacking-roblox-game-hack PDF link annotation
    • https://tjiko.de/wp-content/uploads/fsqm-files/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://tjiko.de/wp-content/uploads/fsqm-files/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • https://tjiko.de/wp-content/uploads/fsqm-files/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • https://tjiko.de/wp-content/uploads/fsqm-files/how-to-give-items-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://tjiko.de/wp-content/uploads/fsqm-files/minecraft-build-hacks_GM479516143.pdfIn PDF document text
    • https://tjiko.de/wp-content/uploads/fsqm-files/how-to-gift-robux-for-free_GM431946152.pdfIn PDF document text
    • https://tjiko.de/wp-content/uploads/fsqm-files/free-hoverboard-roblox_GM431946152.pdfIn PDF document text
    • https://tjiko.de/wp-content/uploads/fsqm-files/claim-free-robux-roblox_GM431946152.pdfIn PDF document text
    • https://tjiko.de/wp-content/uploads/fsqm-files/hack-de-robuxs-2021_GM431946152.pdfIn PDF document text
    • https://tjiko.de/wp-content/uploads/fsqm-files/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://tjiko.de/wp-content/uploads/fsqm-files/how-do-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://tjiko.de/wp-content/uploads/fsqm-files/roblox-free-download-no-sign-in_GM431946152.pdfIn PDF document text
    • https://tjiko.de/wp-content/uploads/fsqm-files/free-robux-generator-really-works_GM431946152.pdfIn PDF document text
    • https://tjiko.de/wp-content/uploads/fsqm-files/how-to-hack-roblox-accounts-without-cheat-engine_GM431946152.pdfIn PDF document text
    • https://tjiko.de/wp-content/uploads/fsqm-files/jailbreak-geld-cheaten-roblox_GM431946152.pdfIn PDF document text
    • https://tjiko.de/wp-content/uploads/fsqm-files/free-robux-codes-july-2021_GM431946152.pdfIn PDF document text
    • https://tjiko.de/wp-content/uploads/fsqm-files/ho-wto-hack-roblox_GM431946152.pdfIn PDF document text
    • https://tjiko.de/wp-content/uploads/fsqm-files/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • https://tjiko.de/wp-content/uploads/fsqm-files/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • https://tjiko.de/wp-content/uploads/fsqm-files/free-robux-link_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_off0000514b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x514B 24912 bytes
SHA-256: d75a057ee703a9aa18a76142c52c312e9ae3cbf8af60126d4d5d6409cabfa7b6
font_01_sfnt_off00008ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AD1 18932 bytes
SHA-256: aef110706da512347d9e59a7a7516f042c8893d905ed64f0a0e422fc2bb292eb

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