Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d1bcf315a0d8079…

MALICIOUS

PDF

34.2 KB Created: 2021-07-04 04:41:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0a68c6bce2c48efd1f1978b8549c97c1 SHA-1: d8e79470efe9257a82a17ed3b65cc6ad22c81bb3 SHA-256: 5d1bcf315a0d80794fda6db8341de9cd35e517a19653a4748fec31cc5d08d9d4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains links to a known malicious redirector, http://netcdn.tw/app/431946152/dailyrobux-game-hack, which is part of a lure for game hacks and generators. The document body and embedded URLs reinforce this theme, suggesting a phishing or scam attempt to trick users into visiting malicious sites. No scripts were extracted, but the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful content.

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/431946152/dailyrobux-game-hack In PDF document text
    • https://diendientuvn.com/public/upload/files/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/roblox-bird-simulator-hack-script_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/coin-master-level-3_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/minecraft-pe-hacked-client-download_GM479516143.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/instagram-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/how-to-get-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/extreme-injector-roblox-hack_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/free-robux-codes-genorateor_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/roblox-how-to-change-your-name-for-free-2021_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/minecraft-java-edition-free-download-for-android_GM479516143.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/how-to-get-spins-for-free-on-coin-master_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/how-to-make-a-roblox-script-hack_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/hacker-minecraft-song_GM479516143.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/free-roblox-gift-card-codes-2021-june_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/coin-master-card-collection-link_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/free-minecraft-account_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E6B 22412 bytes
SHA-256: 8f4a7ef013959b435db27b6c9bf4c0b6df1c86c3f686a058918959ede68fdc11
font_01_sfnt_off00006099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6099 19092 bytes
SHA-256: 319a3b741e60406540a19adb70d742732d8bf817a9bc58f36e4d58ba7e1a6a2d

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