Malicious PDF — malware analysis report

Static analysis result for SHA-256 a449590ce85d1b49…

MALICIOUS

PDF

44.4 KB Created: 2021-06-11 04:55:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: fe3a0d68ddbe938b0d99280d1c69128b SHA-1: 7675e59761f427bcfc29743d25858fad7d3fe811 SHA-256: a449590ce85d1b494daa25768801b2d5573669240bd106f7ea9e6c37db1ca044
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as offers for game hacks and gift cards. The primary lure URL is https://netcdn.tw/app/431946152/get-a-free-roblox-gift-card-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious redirection workflow, likely intended to lead users to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.tw/app/431946152/get-a-free-roblox-gift-card-game-hack In PDF document text
    • http://lib.kunci.or.id/repository/coin-master-free-food_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-hack-online-link_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-mod_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-online-hack-no-survey-no-password_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-dinosaur-simulator-hack-2021_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/minecraft-bedrock-edition-pc-free_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/inappropriate-roblox_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-free-spin-now_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-roblox-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-free-attack_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/50-free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/hack-roblox-tuto_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-hair-roblox-boy_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
stream_004_off00004cf6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CF6 26292 bytes
SHA-256: 55a14ebbb3b5fb95f9b7575e67f6730ccd49d6ea3f0b218d184d122946920299
font_01_sfnt_off00008a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A36 18572 bytes
SHA-256: 7b2bf409358832bdd2d2c32202e477b58c26decc8f1f9bb3bc1a125ecece7fa5

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