Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1a8d911a7b6285…

MALICIOUS

PDF

46.4 KB Created: 2021-06-08 17:54:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 80c2d2dbbfb84aa317dcf359653c56d4 SHA-1: 3cab85a67bf557fc7fe9be74e307ccee6355163f SHA-256: 4b1a8d911a7b62854fa829447c85b74b0f9a7e8011aaabcbabac3cf5b50fb114
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with promises of game hacks and free currency, such as Robux. The primary malicious URL identified is https://netcdn.tw/app/431946152/free-robux-simple-app-game-hack. The document's structure and embedded links strongly suggest an attempt to trick users into downloading potentially harmful files or visiting further malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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/free-robux-simple-app-game-hack In PDF document text
    • http://www.onusgroup.co.in/uploaded_files/userfiles/files/jailbreak-roblox-free-money_GM431946152.pdfIn PDF document text
    • http://www.onusgroup.co.in/uploaded_files/userfiles/files/minecraft-java-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://www.onusgroup.co.in/uploaded_files/userfiles/files/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://www.onusgroup.co.in/uploaded_files/userfiles/files/vip-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.onusgroup.co.in/uploaded_files/userfiles/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.onusgroup.co.in/uploaded_files/userfiles/files/coin-master-latest-version-hack_GM406889139.pdfIn PDF document text
    • http://www.onusgroup.co.in/uploaded_files/userfiles/files/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.onusgroup.co.in/uploaded_files/userfiles/files/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.onusgroup.co.in/uploaded_files/userfiles/files/hacked-roblox-game_GM431946152.pdfIn PDF document text
    • http://www.onusgroup.co.in/uploaded_files/userfiles/files/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://www.onusgroup.co.in/uploaded_files/userfiles/files/coin-master-hack-free-spins_GM406889139.pdfIn PDF document text
    • http://www.onusgroup.co.in/uploaded_files/userfiles/files/how-to-get-free-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.onusgroup.co.in/uploaded_files/userfiles/files/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.onusgroup.co.in/uploaded_files/userfiles/files/are-robux-generators-safe_GM431946152.pdfIn PDF document text
    • http://www.onusgroup.co.in/uploaded_files/userfiles/files/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://www.onusgroup.co.in/uploaded_files/userfiles/files/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • http://www.onusgroup.co.in/uploaded_files/userfiles/files/free-minecraft-mods-for-ps4_GM479516143.pdfIn PDF document text
    • http://www.onusgroup.co.in/uploaded_files/userfiles/files/download-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://www.onusgroup.co.in/uploaded_files/userfiles/files/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • http://www.onusgroup.co.in/uploaded_files/userfiles/files/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004dd1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DD1 24176 bytes
SHA-256: 2c57d38e87625c2203a02708df4e76d8e126b91969c00f49288843b4bdc69ee6
font_01_sfnt_off000084cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84CB 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00009173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9173 18644 bytes
SHA-256: 413eb88baa155e87e49eefa8d2a199a7a74fab85304e9d8f17607c1cde8bfc43

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