Malicious PDF — malware analysis report

Static analysis result for SHA-256 57868f89dbe45ec8…

MALICIOUS

PDF

32.5 KB Created: 2021-07-05 21:42:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9261c802b1d3f3847da9cab24337f30f SHA-1: 9a142aab81abade7c92f7446b9f6e4779ffcbd1f SHA-256: 57868f89dbe45ec8b8c30bf68ecdfeebae300a6300e5408c9944d43d36d4e894
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple links to redirectors and other PDF files, masquerading as 'free generators' or 'game hacks'. The primary redirector URL is http://netcdn.tw/app/431946152/getrobux-now-game-hack. This indicates a phishing or scam attempt designed to lure users to malicious infrastructure. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/getrobux-now-game-hack In PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/free-free-robux_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/coin-master-free-gold-cards-link-2021ee-spins_GM406889139.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/is-tiktok-free_GM835599320.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/oginject-co_GM406889139.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/rewards-robux_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/roblox-avatar-free-wings_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/roblox-hack-2021-ad_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/bad-minecraft-free_GM479516143.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/free-minecraft-codes-2021_GM479516143.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/coin-master-coin-hack_GM406889139.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/javascript-robux-hack-pastebin_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/minecraft-realms-free-codes_GM479516143.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/cheat-engine-roblox-bypass-2021_GM431946152.pdfIn PDF document text
    • http://www.bestbist.com/assets/uploads/pages/files/how-to-get-free-minecraft-coins_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_off00002a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A7C 21852 bytes
SHA-256: 327fba08e46fc4091e103bbda6b857529b6e44f07c06edd9049af9a05feb4884
font_01_sfnt_off00005a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A8E 18820 bytes
SHA-256: c947a45b753295a0739f9e073ebb3c99c504f2b62c282b6d89e2fd1f09780d18