Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77a114c3ba38b80…

MALICIOUS

PDF

43.4 KB Created: 2021-05-15 08:03:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 84f3cacbd3bc666f84ed6851b912bfa8 SHA-1: 25d8464efe91e77153b2941acabef4eeff54fa56 SHA-256: a77a114c3ba38b80efe8f62dfd527f2bd75a27cc90feba2904e75d93735c2f28
168 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a game hack lure to entice users to click on a malicious redirector URL. The document contains embedded URLs that point to known malicious infrastructure, suggesting an attempt to lead the user to a malicious site. No scripts were extracted from this sample, but the presence of embedded URLs and the lure theme strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/431946152/kuso-icu-roblox-hack-game-hack In PDF document text
    • http://76remont-kvartir.ru/images/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/free-coin-master-spins-blogger_GM406889139.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/free-spins-coin-master-links-no-human-verification_GM406889139.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/how-to-hack-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/unlimited-robux_GM431946152.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/all-minecraft-handbooks_GM479516143.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/my-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/coin-master-links-to-free-spins_GM406889139.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/coin-master-free-spins-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/mcpe-hack-client_GM479516143.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://76remont-kvartir.ru/images/coin-master-hack-android-no-root_GM406889139.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_off00004a21.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A21 26456 bytes
SHA-256: 7080d221feda152379164a7406f011df71565c93edb1f7bc2f191e1d066c6e8f
font_01_sfnt_off0000870b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x870B 18320 bytes
SHA-256: 67b96beca271d5ff8db6d4205f4bcb305d403275eb03eb731bd8bb208d3be0d2

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