Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3ac966c405c967…

MALICIOUS

PDF

34.2 KB Created: 2021-07-05 10:02:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 59163c41602c8f2d220cb7a97bf8b69c SHA-1: 973e67d3262a97cdd4fa6d9304c5da0d50a26ed0 SHA-256: cb3ac966c405c96705a8bc3416a50ba6bda31a7ed978bb5a0c0ae9e3e6896d22
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and further PDF files, masquerading as game hacks and generators. The primary redirector URL is http://netcdn.tw/app/431946152/where-to-get-free-robux-game-hack, which likely serves as a lure to download additional malicious content. No scripts were extracted, but the document's structure and embedded URLs strongly indicate a phishing or social engineering attack.

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/where-to-get-free-robux-game-hack In PDF document text
    • http://perpus.wdh.ac.id/repository/robloxhacks_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-hack-online-2021_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/how-to-hack-death-run-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/hack-robux-into-roblox-account_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/fray-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/world-zero-hack-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/spin-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/do-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/how-to-get-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-robux-generator-2021-hack_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/minecraft-pe-apk-free-download_GM479516143.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/roblox-studio-free-scripts_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/rbx-earn_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/hack-robux-2021-inspect-element_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/acount-hacking-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/roblox-hackprogamers-com_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/roblox-level-7-script-executor-hack_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_off00002d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D62 22588 bytes
SHA-256: a3a021b881ace0e9179f17adc814c940715a75e02110e1174a670dca21c88a2d
font_01_sfnt_off00006015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6015 19184 bytes
SHA-256: e942b93b228ea09a2b9b89b185e62feaf889c583a2152a741a620a9da1dbb754

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