Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a3bd23efb25305…

MALICIOUS

PDF

35.7 KB Created: 2021-06-25 12:01:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4274cea55682d94409220c452e14f735 SHA-1: 76555a02cd9fecc0c8c1cf0fc9438faf09e77c85 SHA-256: 51a3bd23efb25305f607bee0249ff6a3cc7f214ed88253ffd034cb9efb076c14
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a malicious redirector for a 'game hack' lure. The document body and embedded URLs suggest a social engineering attempt to trick users into downloading potentially unwanted or malicious content. The presence of multiple redirector links indicates a deliberate effort to obscure the final destination and potentially deliver a second-stage payload.

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.co/app/406889139/coin-master-hack-without-verification-2021-game-hack In PDF document text
    • https://perpus.uwhs.ac.id/repository/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/its-free-roblox-ad-released_GM431946152.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/hack-murder-mystery-roblox_GM431946152.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/roblox-free-items_GM431946152.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/roblox-studio-how-to-make-a-free-robux-game_GM431946152.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/free-auto-clicker-for-roblox-ios_GM431946152.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/cheat-engine-gui-roblox_GM431946152.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/free-tiktok-followers-trial_GM835599320.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/minecraft-hacked-apk_GM479516143.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/roblox-rc7-hack-2021_GM431946152.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/roblox-avatar-the-last-airbender-cheat-engine_GM431946152.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/free-spins-coin-master-site-wwwquoracom_GM406889139.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/coin-master-cheats-free-spins_GM406889139.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/free-robux-com-roblox_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_off00003271.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3271 23144 bytes
SHA-256: 1e7c87237a6cd52bcba05d5720859f12059e007b87b2a4df451331d06b321351
font_01_sfnt_off000066a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66A2 19044 bytes
SHA-256: bc164ad6cfe60f57cf308bf587fcf39d6d442c5b14af35d4986789bcc521b71c

Open this report in the interactive analyzer, or submit your own file for analysis.