Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83a3454170cc9cd…

MALICIOUS

PDF

43.8 KB Created: 2021-06-13 21:11:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: af39f61fa73216f581269ab8052c7c24 SHA-1: 12631fa48736aa65d0c88ff59524769f3bf168b9 SHA-256: c83a3454170cc9cd01c5e7eb6f1654160f43ed38256ab80e82c1b22b720b55fe
82 Risk Score

Malware Insights

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

This PDF document employs a common lure, advertising a "Delta Roblox Hacking Tool" and providing a link to download it. The link, http://netcdn.co/app/431946152/delta-roblox-hacking-tool-game-hack, likely leads to a malicious payload. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the use of a game hack redirect lure. No scripts were extracted, but the document's structure and embedded URLs point towards a social engineering attack designed to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.co/app/431946152/delta-roblox-hacking-tool-game-hack PDF link annotation
    • http://lib.uho.ac.id/library/repository/how-to-hack-roblox-june-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-codes_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/google-play-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-cheats-without-verification_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/hack-coin-master-apk-ios_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-minecraft-svg-cutting-files_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-hack-deutsch-auf-pc_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-software-download_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-free-android_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/doctor-louie-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-hack-m-coins-mcpe-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-70-spin-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/hack-minecraft_GM479516143.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_003_off00004b81.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B81 25504 bytes
SHA-256: 462c585432c33a1590eee9bbfa3275c6416081c3081b71e216fb4e0f18060581
font_01_sfnt_off00008722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8722 18864 bytes
SHA-256: 11479a3438103ff89877035dbd33405f02baf24758a0ee1e0274d692dfcca239

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