Malicious PDF — malware analysis report

Static analysis result for SHA-256 310ec3e8e2d885db…

MALICIOUS

PDF

48.8 KB Created: 2021-06-03 09:19:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ca58b916884cde6df08a2ec54d969ec4 SHA-1: c89bb92cb3b96074a782295547fb8dd7afca7946 SHA-256: 310ec3e8e2d885dbbfd68bb9a81905251a72ba17ce275ff49240b0296b5dfe9a
160 Risk Score

Malware Insights

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

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising game hacks and currency generators. The heuristic firings indicate that these links are part of a known malicious redirector chain, designed to lure users into downloading potentially harmful files or visiting compromised sites. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence score suggest a malicious intent to exploit user interest in game cheats.

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.online/app/406889139/coin-master-unlimited-spin-apk-free-download-game-hack In PDF document text
    • http://empresa-venta.hr/files/hack-coin-master-online-without-human-verification_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/free-robux-today_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/roblox-admin-hack_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://empresa-venta.hr/files/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/free-800-robux_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://empresa-venta.hr/files/coin-master-400-spin-link-hack_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/free-gold-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/i-cant-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/minecraft-mods-download-free_GM479516143.pdfIn PDF document text
    • http://empresa-venta.hr/files/coin-master-free-spins-without-verification_GM406889139.pdfIn PDF document text
    • http://empresa-venta.hr/files/roblox-games-with-free-boombox_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://empresa-venta.hr/files/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 7

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_off00005326.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5326 25232 bytes
SHA-256: 081b584fe09cd44b54bf6e81f1f44bab2c38ee65f9b3b9f8bcefcc22103013b1
font_01_sfnt_off00008cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CDD 2928 bytes
SHA-256: 64242521e32848fe2434190b0c7414fcd492221a3cc2972c66f57f4842775e11
font_02_sfnt_off000096fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96FB 19996 bytes
SHA-256: 3c29555b0793fe48ce04921bc98cca136cf57a9c16aa7c6aa04b71a886ac1933

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