Malicious PDF — malware analysis report

Static analysis result for SHA-256 877d27141361d1f2…

MALICIOUS

PDF

33.5 KB Created: 2021-06-19 22:01:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 79e86eeb2469c8d743ae33d17135f965 SHA-1: 1a08433ec6eb4a1c95135604f313eecdb7c90abb SHA-256: 877d27141361d1f26c1b3bed66dc8a5b9dfbedd5b1f8a2fc27a6985e377304c4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links, including one identified as a malicious redirector. The document body and heuristics indicate a lure for "free Robux" or game hacks, directing users to the URL http://netcdn.co/app/431946152/free-robux-glitch-2021-game-hack. This suggests the file is part of a phishing or scam campaign, likely delivered as a spearphishing attachment.

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.co/app/431946152/free-robux-glitch-2021-game-hack In PDF document text
    • http://pustaka.pn-calang.go.id/repository/how-to-get-free-robux-on-android-tablet_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/withdraw-robux_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-robux-working-2021_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/minecraft-windows-10-edition-unlock-full-game-free_GM479516143.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/roblox-hack-app_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/youtube-roblox-hacks-for-rubox-com_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/cheat-codes-for-roblox-skywars-how-do-u-get-costumes_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/funnest-roblox-script-to-hack-games_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/how-to-hack-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-free-roblox-games_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/moon-active-games_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-bobux_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/avast-bloque-les-cheats-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/roblox-skybox-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_off00002d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D07 21512 bytes
SHA-256: ec06501bcd1d8cc84e55cfd569b2a4b9395bdf03a93604802b13bf5e9628800f
font_01_sfnt_off00005c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C31 19580 bytes
SHA-256: 49ba4baf702fc5c58a1f029aa7a71d52698b25bddccb56a1fea57918bb04c541

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