Malicious PDF — malware analysis report

Static analysis result for SHA-256 87db53abf67ed76e…

MALICIOUS

PDF

37.2 KB Created: 2021-07-04 02:22:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f6dd545163e84bda746f23c6cb4f741e SHA-1: 7b10c9964f5cd67ec3ac52fbd8496b7cd96e7dba SHA-256: 87db53abf67ed76e5d571b2f2e43368728347be856c293b7f7d6478c71e42258
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one pointing to a known malicious redirector infrastructure at http://netcdn.tw/app/431946152/can-i-get-hacked-on-xbox-roblox-game-hack. The document body and extracted URLs suggest a lure for game-related cheats or hacks, likely intended to lead users to a phishing or malware download site. No scripts were extracted, but the presence of malicious redirectors and the lure indicate a high likelihood of a phishing or credential harvesting attempt.

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/can-i-get-hacked-on-xbox-roblox-game-hack In PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-get-free-spins-on-coin-master-without-waiting_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-spin-appscoin-master_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/hack-roblox-account-passwords-2021_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/pokemon-go-free-coins-apk_GM1094591345.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-robux-discord_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/minecraft-free-ios_GM479516143.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/pokemon-go-free-2021_GM1094591345.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/roblox-stylish-animation-pack-free_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-make-roblox-clothes-for-free_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-roblox-with-tasks_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/minecraft-tiktok-hacks_GM479516143.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/cheat-roblox-obby_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-hack-roblox-2021_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_off00003ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BA9 22368 bytes
SHA-256: f71bf65633d975de25737648652d053ff49a811b04df413919835b82aab3c84c
font_01_sfnt_off00006d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D78 18748 bytes
SHA-256: d972e8e5ff5ffb567dedee57b4b2b16ae3a7b47237f38760c770a07ffeeba6be

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