Malicious PDF — malware analysis report

Static analysis result for SHA-256 987a541a09b98b72…

MALICIOUS

PDF

36.4 KB Created: 2021-06-26 19:39:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1dee2071e583e3f6e41a87bebdab5229 SHA-1: 95f7f2395018aed533a938ec586278860c0d9466 SHA-256: 987a541a09b98b7270d780538ffab5a8ee6d5d1c8a2f3b9d74637dcf485cc5dc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for a 'free generator / game hack' that links to known malicious redirector infrastructure. The document body explicitly contains the URL http://netcdn.co/app/431946152/how-to-look-like-myusernamesthis-in-roblox-for-free-game-hack, which is also flagged by heuristics as a malicious redirector. This suggests the document is designed to trick users into visiting a malicious site, likely for further exploitation or malware delivery.

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/431946152/how-to-look-like-myusernamesthis-in-roblox-for-free-game-hack In PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/free-spins-coin-master-twitter_GM406889139.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/how-to-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/easy-points-gg_GM431946152.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/no-robux_GM431946152.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/coin-master-daily-free-spins-25_GM406889139.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/minecraft-linux-free_GM479516143.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/minecraft-free-school_GM479516143.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/roblox-heroes-online-free_GM431946152.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/coin-master-hack-ios-no-verification_GM406889139.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/event-free-robux_GM431946152.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/how-do-you-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/coin-master-free-spins-no-survey_GM406889139.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/roblox-moderators_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
font_00_sfnt_off00003339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3339 22788 bytes
SHA-256: 025ffffa15d78d58659bfb7eb78f7d603a08263713a38fea7c7f321002006e9b
font_01_sfnt_off00006649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6649 20148 bytes
SHA-256: 17df4a39beb164f6d56d04747c3bda9e23c662d2fdd170124673a4a39db03ddc

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