Malicious PDF — malware analysis report

Static analysis result for SHA-256 61fb072677d75768…

MALICIOUS

PDF

44.7 KB Created: 2021-05-12 00:48:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e63ea0645a4d3e2f44f38bf5d661f436 SHA-1: 57910171f67710c0606451065bfd2a7c22ecd88f SHA-256: 61fb072677d7576849a178ffa4a1e800eda54ffd5135c8f63edcc694ed4648d7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document employs a common lure related to game hacks and generators, specifically targeting "Coin Master" and "Robux" cheats. It contains multiple embedded URLs that point to a known malicious redirector infrastructure. The primary URL, https://netcdn.xyz/app/406889139/coin-master-hack-2021-without-verification-game-hack, is flagged as malicious and likely serves as a gateway to further malicious content or phishing pages. No scripts were extracted, but the document structure and embedded URLs strongly indicate a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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.xyz/app/406889139/coin-master-hack-2021-without-verification-game-hack In PDF document text
    • https://jas8.com.tw/image/data/files/coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/what-is-robux_GM431946152.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/free-robux-no-email_GM431946152.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/hack-avatar_GM431946152.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/coin-master-hacks-for-pet-food_GM406889139.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/coin-master-70-spin-link_GM406889139.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/free-robux-gen_GM431946152.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/ultimate-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/microsoft-roblox-rewards_GM431946152.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/coin-master-card-collection-hack_GM406889139.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • https://jas8.com.tw/image/data/files/free-robux-legit_GM431946152.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_003_off00004674.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4674 25736 bytes
SHA-256: c5922de2bf97c7c0d189421d41988c04170d7b656e8487589d1893e3dc5ed376
font_01_sfnt_off000080f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80F9 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AAB 18756 bytes
SHA-256: 8aa4e312459bb9d5d616f22e45372e364c039c39adebed3f09684cd63dbfffd3

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