Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b249dcbab9a3ad…

MALICIOUS

PDF

45.1 KB Created: 2021-05-14 12:38:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 21968efcceac888dfd4d580d9cc88a7e SHA-1: 8a8dccd66d203785c8b59b4332467b33e1542206 SHA-256: d1b249dcbab9a3ad12079d2efd8c2b2d8f2d4c13956942ad433e400417162feb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to a malicious redirector disguised as a game hack generator. The document body, though heavily obfuscated, contains references to the same malicious URL. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

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/master-coins-free-game-hack In PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/minecraft-hacks-xbox_GM479516143.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/online-coin-master-free-spin-app_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-reward-link-2021_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/robux-cheat_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-limiteds-roblox_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/how-can-i-get-robux_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/bloxland-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/how-to-cheat-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/roblox-arsenal-hacks-download_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-100-spin-slot_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/minecraft-ios-mods_GM479516143.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/claim-free-robux-button_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_off0000490b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x490B 25432 bytes
SHA-256: 4df6897c25de875e7cc76972acb8f4c03e5cb93669bd1a6c3f9994488598608a
font_01_sfnt_off00008364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8364 3380 bytes
SHA-256: 1dd933c112880b232546f3aab6a17784a8f412d39fd551cc6eb31c5a04c3ce57
font_02_sfnt_off00008f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F4D 17712 bytes
SHA-256: 91e2622ab411f5265f7b42a83c7ab878b3bc5f44429a3c49d98d87fe55e59feb

Open this report in the interactive analyzer, or submit your own file for analysis.