Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c366ad934fb9437…

MALICIOUS

PDF

47.3 KB Created: 2021-06-03 14:11:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 3627461c8485ba880fd44fdd873b88f4 SHA-1: e5fbc2c761974b0333bd74f306083521156161d8 SHA-256: 1c366ad934fb9437bcefdd52f6ca14e7f8b0b62d469fe3843ea16c75cd143fb6
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a prominent link disguised as a game hack lure, directing users to 'https://netcdn.online/app/431946152/rbx-claim-game-hack'. This heuristic, combined with the ML classifier's high confidence, indicates a malicious intent to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure itself facilitates the embedding of malicious links, likely intended to initiate a download or further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.online/app/431946152/rbx-claim-game-hack PDF link annotation
    • http://library.ulb.ac.id//repository/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-mod-version-free-download_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/10-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-hack-ios-reddit_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-spins-link-31-march-2021_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-free-coins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-that-actually-work-2021-not-banned_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-money-roblox-rocitizens_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/www-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/pig-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-apk-hack-download_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-spins-a2z-help_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/pokemon-go-free-808_GM1094591345.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-person_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/como-hackear-el-juego-coin-master_GM406889139.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_off00004f67.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F67 32420 bytes
SHA-256: a7f25f93472fc585defd6fb2d0f2e70203516ee71df0b99e134a654f0d7515bd
font_01_sfnt_off000096db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96DB 18252 bytes
SHA-256: 07c363ffd4f8b13cbf3de9b0a66d92685f9ea0c409a4ceeea91561e0847d81c0

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