Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c5c6c6bd5f0c5e…

MALICIOUS

PDF

49.8 KB Created: 2021-06-09 17:09:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: fb1721848a834cafc0552c7049e37219 SHA-1: 6d62c2fc92b931982e806d43d249617d9fb3f627 SHA-256: b7c5c6c6bd5f0c5e1c264fc9c0e13d65f63736f8d695a60dd29cdac7970bb721
160 Risk Score

Malware Insights

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

The PDF contains multiple links that redirect to malicious infrastructure, masquerading as game hacks or generators. The primary lure URL is https://netcdn.tw/app/431946152/dragon-keeper-roblox-cheats-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit vulnerabilities or trick the user into downloading further malicious content, aligning with common social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.tw/app/431946152/dragon-keeper-roblox-cheats-game-hack In PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-mad-city-hack-money-francais-saison-3_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-free-spins-link-2021-app_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/minecraft-free-download-no-virus_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/claim-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-free-dominus-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/minecraft-for-laptop-free_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/robuxfree-con_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-hack-activegamer_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/tiktok-for-free-textbooks_GM835599320.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-using-inspect_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/hacking-apps-for-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-34-4-hack_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000507f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x507F 28140 bytes
SHA-256: f65621feb0f8e0a602b46d655d2b21ba55d50e6c2c4bff33f3c87f017cf51059
font_01_sfnt_off000090be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90BE 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DD0 18916 bytes
SHA-256: 18b6d7deedacbf33003cfbf27a0610b0a28def11b341633874ecdd29cd9a19e1

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