Malicious PDF — malware analysis report

Static analysis result for SHA-256 17f921643d4137af…

MALICIOUS

PDF

35.0 KB Created: 2021-07-03 16:07:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 50870e90a599959085ef6c24035215c4 SHA-1: fa5b3d538118d5380cbb52e6d5b179c67c1cf498 SHA-256: 17f921643d4137af88cc45e062b4620090f04dc499bc4030b965f52e27ec457f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as "free generator / game hack" lures for popular games like Roblox and Minecraft. The document body explicitly contains the URL "http://netcdn.tw/app/431946152/how-to-get-free-robux-2021-no-human-verification-game-hack", which is flagged as a malicious redirector. This indicates a phishing or scam attempt designed to lead users to potentially harmful content or further malware downloads.

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/how-to-get-free-robux-2021-no-human-verification-game-hack In PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/minecraft-java-free-account_GM479516143.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/how-to-get-free-things-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/free-robux-real_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/pubg-uc-2-all-pro_GM1330123889.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/how-to-get-robux-for-free-on-pc-without-downloading_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/roblox-free-robux-obby-link_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/how-to-hack-roblox-account-on-mobile-2021_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/synapse-roblox-free-download_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/minecraft-pe-apk-download_GM479516143.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/sign-in-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/ro-ghoul-script_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/nuevo-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/roblox-unlimited-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/minecraft-redeem-code-free_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
stream_002_off00002eb8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2EB8 22496 bytes
SHA-256: 74238aa1b137ffb230bb4e4a1778b36b12fb9f1b2e1f4df9575530b1a47ec596
font_01_sfnt_off00006120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6120 19900 bytes
SHA-256: 73ca12d001f484cb7e916eddfb38cb68c81d0268ac20e02f4c1cc4bb789b0b63

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