Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc01660c99d9661…

MALICIOUS

PDF

34.7 KB Created: 2021-07-04 22:29:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e0fcae55ac8ce63a34273a13af8d9bba SHA-1: 68b7963cba4a215e16cc7e2a71b95628e43d3e3b SHA-256: 5fc01660c99d966131c3b11ec1e506d971353b5193bb12f97f1267e66ae0545c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including a known malicious redirector at http://netcdn.tw/app/431946152/robux-no-verification-game-hack. These links are presented as lures for game hacks and free currency, indicating a social engineering tactic to drive users to potentially malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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-no-verification-game-hack In PDF document text
    • http://perpus.wdh.ac.id/repository/free-role-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-robux-that-actually-work-2021-not-banned_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/get-free-robux-in-1-minute_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-hack-version-download_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/add-robux-us-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-roblox-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/simon-says-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/theres-no-way-of-getting-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/how-to-get-free-coins-in-mcpe-master_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/robloxcom-robux-and-tix-hack_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/how-to-make-t-shirts-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/roblox-muscle-shirt-free_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/roblox-how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/how-to-cheat-at-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-arsenal-hacks_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/claim-free-robux_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_off000031c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31C0 22180 bytes
SHA-256: b91420d609a974f99ffd20b17343b1e1cdc8ecc7fbe19f2906e6dd9e9e7f6fc2
font_01_sfnt_off000062f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62F9 18912 bytes
SHA-256: 5371eeb4f32645909a106e2314d3e19630680129b8a7356391e2a50deb7f8a6b