Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e7176948692f0a…

MALICIOUS

PDF

47.8 KB Created: 2021-06-07 03:47:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 71b1754b05337c61dba206568c73a660 SHA-1: 6287a0c784ec49b7df593c13b1732af6173a736d SHA-256: c4e7176948692f0a30de27f25b436636749da420e7293668316ef5e99535d82a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector domains and websites that promise free game-related currency or hacks, a common lure for phishing or malware. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the embedded URLs and the nature of the lures strongly suggest a malicious intent to redirect users to potentially harmful sites.

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.tw/app/431946152/free-robux-android-2021-game-hack In PDF document text
    • https://www.jjpremiers.com/files/coin-master-hack-download-2021_GM406889139.pdfIn PDF document text
    • http://jjpremiers.com/files/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • http://jjpremiers.com/files/free-100-robux_GM431946152.pdfIn PDF document text
    • http://jjpremiers.com/files/hack-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://jjpremiers.com/files/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://jjpremiers.com/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://jjpremiers.com/files/10-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://jjpremiers.com/files/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • https://www.jjpremiers.com/files/coin-master-connection-lost_GM406889139.pdfIn PDF document text
    • http://jjpremiers.com/files/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://www.jjpremiers.com/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.jjpremiers.com/files/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://www.jjpremiers.com/files/coin-master-hacks-reddit_GM406889139.pdfIn PDF document text
    • https://www.jjpremiers.com/files/legit-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.jjpremiers.com/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://jjpremiers.com/files/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.jjpremiers.com/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://www.jjpremiers.com/files/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://jjpremiers.com/files/is-minecraft-free-on-mac_GM479516143.pdfIn PDF document text
    • http://jjpremiers.com/files/get-free-robux-without-doing-anything_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_004_off00004d97.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D97 25864 bytes
SHA-256: 72d8d7e31e4accadba16bbdb40a6b152d49347d662c1ef08844cba7b7b762e84
font_01_sfnt_off000089bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89BB 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off000096cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96CD 18712 bytes
SHA-256: 8bad1a6728ac2f577545f8f6d1bc00a1c94167d6981a4a29a20f2f221244de03

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