Malicious PDF — malware analysis report

Static analysis result for SHA-256 51594fa567b821f6…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 14:23:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5a28d367ecd6e9ba7c30dafa6e476dc9 SHA-1: 443283fba789e31b9f21ac78ea718e76d3635bb6 SHA-256: 51594fa567b821f6073cab4bbae93de135a9478cde8aca8f82546c148aed684b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to known malicious infrastructure, specifically advertising game hacks and generators. The document body and embedded links strongly suggest a lure to trick users into visiting potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/406889139/haktuts-coin-master-today-game-hack In PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-instakill-npc-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-giveaway-now_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-game-pack-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/hacks-for-roblox-parkour-fly_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-breaking-point-script-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-bugatti-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-font-free_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-island-royale-download-free_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/future-free-roblox-exploit_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-valkyrie-helm-free_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-free-spins-hacktman_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-hack-com_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/theme-park-tycoon-2-roblox-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-outfits-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-roblox-backdoor-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-hack-roblox-to-get-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_002_off000031a7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31A7 22952 bytes
SHA-256: e6a94ab8dfc56c54983c80609603442ba24ea8f64a9369e5f718c653abaedf98
font_01_sfnt_off000064f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64F9 18500 bytes
SHA-256: de4287b4d7c6ca7204c59268274f8693e9d2fc3133188a60d6bd2877f4507d7b

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