Malicious PDF — malware analysis report

Static analysis result for SHA-256 61cdadff7604b3f2…

MALICIOUS

PDF

47.5 KB Created: 2021-06-03 07:45:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 994804c9684b8c979f7c6030172a602f SHA-1: 9699c6864ef2ebd719cbba5a0192ee824fc68034 SHA-256: 61cdadff7604b3f2b1c110bd86d5b03cd87e761d2e4b06c143263e52accd4e32
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains an embedded URL and a visual download button, strongly suggesting a social engineering lure. The ML classifier also flagged this PDF as malicious. The primary URL, https://netcdn.online/app/406889139/coin-master-2021-free-spins-game-hack, likely hosts a secondary payload or exploit. The document body, though partially corrupted, contains references to 'Coin Master' and 'free spins', aligning with common phishing and scam lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.online/app/406889139/coin-master-2021-free-spins-game-hack In PDF document text
    • https://opac.itp.ac.id/repository/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/coinmaster-spins_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/coin-master-free-daily-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/ww-robux_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/book-on-how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/moonactive-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-roblox-accounts-dantdm_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-minecraft-hosting-24-7_GM479516143.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/pokemon-go-free-636_GM1094591345.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/bloxton-interview-center-anti-cheat-roblox_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/how-to-get-free-shields-on-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-roblox-accounts-generator_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/robux-scam_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/best-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004ee0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EE0 30452 bytes
SHA-256: 93dc65815dd5202e02ba416c4d404d319cdc90be7460d4026eec16ac68a317e3
font_01_sfnt_off00008ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CE3 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off00009696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9696 18288 bytes
SHA-256: 512188fbd9df787eb973cc190579836d1eec1c2cf91c6a5c2e6dbe230c0a69fa

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