Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bba09c71c7833c4…

MALICIOUS

PDF

33.3 KB Created: 2021-07-05 03:35:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 03b88c9a8c9f10d656538ee45ea468d3 SHA-1: a138d4b445a5e9acf94dcc175fa57008c4eb2524 SHA-256: 1bba09c71c7833c4962a8546f2dad9bfd46bfaa25f7a028ab12cb5365b3a4bbe
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple links to known malicious redirector infrastructure, specifically advertising 'free generators' and 'game hacks' for popular games. The primary lure URL is http://netcdn.tw/app/431946152/robux-premium-game-hack, which is flagged as a malicious redirector. The document body and embedded URLs suggest a phishing or scam attempt to trick users into visiting potentially harmful sites.

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/robux-premium-game-hack In PDF document text
    • https://c2o-library.net/catalog/repository/free-for-now-info-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-spins-today-39_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-daily-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/wizard-simulator-roblox-hack_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/freerobuxhack-us-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/can-you-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/extreme-roblox-hack_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-robux-generator-cheat-files_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/hacking-community-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-online-hack-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/https-roblox-hack_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-cosed_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-robux-javascript-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-robux-hack-pastebin-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-codes-september-2021_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_off00002c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C9D 21880 bytes
SHA-256: d79a50aa758e5ec0c1d079cad8d2839d58cd44022b406e7890fff982bc8b80e4
font_01_sfnt_off00005cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CDB 19088 bytes
SHA-256: 0376592e8995eb0f372276b64c792de2056798c1820649ffa43bc7edbb90fe18

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