Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef28c083c30a583f…

MALICIOUS

PDF

35.6 KB Created: 2021-07-05 09:47:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c95fcca70ea4bedeed77a0858082ecc3 SHA-1: 5b5138fc83725c8d974dacbc16687e5b84e05cf9 SHA-256: ef28c083c30a583fd9c09553a1ba4b4e3c6bc62340df25b34788b7c245f19433
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high-severity heuristic indicating it links to a 'free generator / game hack' redirector, specifically http://netcdn.tw/app/479516143/how-to-play-minecraft-for-free-on-pc-game-hack. The document body also contains this URL and mentions 'How To Play Minecraft For Free On Pc', reinforcing the lure. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of external URIs and the lure suggest an attempt to redirect the user to a malicious site, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/479516143/how-to-play-minecraft-for-free-on-pc-game-hack PDF link annotation
    • https://library.stikeswnpalu.ac.id/repository/free-robux-youtube-kazok_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/hack-counter-blox-roblox-offensive-download_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/why-doesnt-my-penguin-hack-on-roblox-jailbreak-work_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/rich-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/hack-roblox-pastebin-com_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/roblox-team-change-script-pastebin-hacking_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/win-free-robux-new-game-order_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/free-robux-watching-adds_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/how-to-get-free-robux-scam_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/free-robux-generator-no-survey-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/coin-master-free-spin-facebook-link_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/roblox-how-to-get-robux-hack_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/robux-hack-that-saves_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/hack-i-roblox-2021_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/minecraft-pe-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/microsoft-bing-robux_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/roblox-cheats-for-phone_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/gary-s-hod-infinite-life-hack-roblox_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/coin-master-free-coins-app_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/websites-that-give-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
font_00_sfnt_off00003570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3570 22628 bytes
SHA-256: 2c1e4076f1e239f5394e6a6293f1141815fbd6c0dda05a6a7f298cd41dc6836a
font_01_sfnt_off000067de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67DE 18568 bytes
SHA-256: 90e398c377e7a947f36a4c3f80ba8dac4b97ac83d22629dd8268e1692fc1d19e

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