Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ecb3821b2b0f80…

MALICIOUS

PDF

34.7 KB Created: 2021-07-06 14:14:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: ff8332996bf251ad34da7e8eb8d00da4 SHA-1: 346f8ea412867cf4e3c5640d95e28eb90e261651 SHA-256: 78ecb3821b2b0f80a50caff45743fb919a437bfac98a2d87bdc17c7c7a61424f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a malicious redirector, masquerading as a generator for game currency or hacks. The primary lure is the URL http://netcdn.tw/app/431946152/roblox-generator-no-human-verification-game-hack, which is associated with known malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering attack aimed at tricking users into visiting malicious sites, likely for further malware delivery or credential harvesting.

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/roblox-generator-no-human-verification-game-hack In PDF document text
    • https://akbidprimahusada.ac.id/elibrary/repository/how-to-do-hacks-with-admin-roblox_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/coin-master-coins_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/easy-robux_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/minecraft-xray-hack_GM479516143.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • https://akbidprimahusada.ac.id/elibrary/repository/prison-life-roblox-cheat_GM431946152.pdfIn PDF document text
    • https://akbidprimahusada.ac.id/elibrary/repository/how-to-sell-items-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/how-to-get-minecraft-for-free-on-laptop_GM479516143.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/daily-free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/free-robux-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • https://akbidprimahusada.ac.id/elibrary/repository/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/roblox-hacked-version_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/hackear-roblox-cuenta_GM431946152.pdfIn PDF document text
    • https://akbidprimahusada.ac.id/elibrary/repository/how-to-speed-hack-roblox-with-artmoney_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/can-i-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/minecraft-free-online-unblocked_GM479516143.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_off00003184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3184 21956 bytes
SHA-256: 8ec217283d6d8bcb0e977ef43c4368720f06b404fffd196cbb42553f33ea628a
font_01_sfnt_off000061fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61FA 19244 bytes
SHA-256: d1b73b6c9b414ff984acb0e517d90fd3f78e9a2b39bf0dc724f474e366efabcd

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