Malicious PDF — malware analysis report

Static analysis result for SHA-256 645b7f0020de3995…

MALICIOUS

PDF

41.3 KB Created: 2021-05-15 04:27:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a64ff02a25908ae7832296de3d3cbf6f SHA-1: 73ec77f9992752ac5f9e412d6174179a1765f632 SHA-256: 645b7f0020de39955e2dbe01554cbf9e3b26f45fbf8603fda4ecbdd568eb1999
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically a site offering a 'free coin app game hack'. The document body and embedded URLs strongly suggest a lure for users seeking in-game currency or cheats, which is a common social engineering tactic. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/free-coin-app-game-hack In PDF document text
    • http://www.marambio.com.ar/images/what-do-points-do-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/wurst-client-download_GM479516143.pdfIn PDF document text
    • http://www.marambio.com.ar/images/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/how-do-you-get-robux_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/minecraft-115-2-hacks_GM479516143.pdfIn PDF document text
    • http://www.marambio.com.ar/images/roblox-earn_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.marambio.com.ar/images/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://www.marambio.com.ar/images/get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.marambio.com.ar/images/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://www.marambio.com.ar/images/free-spins-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://www.marambio.com.ar/images/free-robux-meme_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/update-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.marambio.com.ar/images/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://www.marambio.com.ar/images/google-roblox-games_GM431946152.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_003_off00004adb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ADB 24256 bytes
SHA-256: 562ec7357023b0e919afbd2430fda22d373750f09abcfec68893a16adb771544
font_01_sfnt_off00008175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8175 17552 bytes
SHA-256: 3e821414a1aa04839473d5e3e49ecd37671cffeae8faf9e4bac32a085a39f5e4

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