Malicious PDF — malware analysis report

Static analysis result for SHA-256 998eae5d6fdc1092…

MALICIOUS

PDF

49.1 KB Created: 2021-06-11 02:13:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 87b160b4d5fa4171727ef83897ce86e2 SHA-1: 5149889ddd347883c6c98fc37d22aba5de65f1c1 SHA-256: 998eae5d6fdc10921a114bdfe7076503482aa5513708c01ca28227d2be1f0662
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirector infrastructure, specifically advertising 'free Robux' or game hacks. The primary redirector URL is https://netcdn.tw/app/431946152/free-robux-download-pc-game-hack, which is designed to lure users into downloading potentially malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/free-robux-download-pc-game-hack In PDF document text
    • https://perpustakaan.stami.ac.id/repository/aimbot-for-roblox-free-for-all_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/instagram-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-hack-apk-link_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/2021-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-roblox-clothes-boy_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-robux-please_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/robux-xyz_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/roblox-rape_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-redeem-codes-for-robux-october-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/robux-free-online_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/roblox-sexually-abused_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004e83.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E83 28780 bytes
SHA-256: e40fdb3419e730290bed7fd56e49be18e573c16189b48373ac71e83200fe36bc
font_01_sfnt_off00009136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9136 2852 bytes
SHA-256: e9630f3bb738ae3bc329a423cf069c8035d70ce2227e3557c42815f85ad3284f
font_02_sfnt_off00009af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AF8 18976 bytes
SHA-256: 50b141e5dd8672019aa3eed9ca7c2b775f41a0bd02bb6c4e41e4bc7cc139ed78

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