Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c6d87476bf91c5f…

MALICIOUS

PDF

33.8 KB Created: 2021-07-03 23:59:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8f7363b52806227930158125ffc60d3a SHA-1: d4b09ed0482243691c53c9d19b721bd0a3936813 SHA-256: 1c6d87476bf91c5f8ce984b3e3a7c6264a7cc2072e592c132ce3e75a3c2561a6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains multiple links, including one pointing to http://netcdn.tw/app/431946152/lots-of-robux-game-hack, which is identified as a malicious redirector. The document body and heuristics suggest a lure for game-related cheats or generators, a common tactic for distributing malware. The ML classifier strongly flags this PDF as malicious, indicating a high likelihood of exploitation.

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/lots-of-robux-game-hack In PDF document text
    • http://elib.acls-indonesia.com/repository/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/hack-para-tener-robux-2021-julio_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/150-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/free-multiplayer-minecraft-server_GM479516143.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/archery-master-3d-unlimited-coins-hack_GM406889139.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/make-free-robux_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/online-free-roblox-no-download_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/free-robux-website-by-ads_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/roblox-the-mad-murderer-chat-voice-free_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/free-robux-generator-online-no-survey-scratch-studio_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/free-custom-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/roblox-ro-port-tycoon-cheats_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/is-roblox-studio-free_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/easy-robux-hack_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/free-verify-email-roblox_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/how-to-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/we-hack-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F56 22088 bytes
SHA-256: 7f218a53d802763c57a7d610a549509bebf79e89c3d2d8d727b91ee1cb93d660
font_01_sfnt_off00006023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6023 18656 bytes
SHA-256: a4ea5988f9a4bfb02c938a19077db93e73111135e2d6ed68cabd9fb167a683f2

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