Malicious PDF — malware analysis report

Static analysis result for SHA-256 d45fccee5aeae7f8…

MALICIOUS

PDF

45.3 KB Created: 2021-06-13 17:19:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: cf90829cbc7abb102d627d84b334a24a SHA-1: d8de9a255c88695cffca545ba0429c00c1be8402 SHA-256: d45fccee5aeae7f804c26cc64cceb3a39d9271e3a64ab24c580c7e0a22dcac7d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and sites offering game hacks and free currency, indicating a lure-based attack. The presence of embedded URLs and a call-to-action button suggests an attempt to trick the user into clicking through to malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 http://netcdn.co/app/431946152/hacking-into-games-vip-rooms-roblox-game-hack In PDF document text
    • http://centr-expert.su/images/free-robux-codes-november-2021_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/tiktok-free-2021-followers_GM835599320.pdfIn PDF document text
    • http://centr-expert.su/images/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • http://centr-expert.su/images/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/free-spins-coin-master-site-wwwquoracom_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/coinmasterfreespinlink_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/robux-hack-inspect-element_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/free-coin_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/free-vip-server-roblox_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/to-to-hack-robux-using-script_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/roblox-free-pants_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/hack-jailbreak-roblox-2021-menu_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/free-robux-codes-2021-not-used_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_004_off00005313.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5313 24668 bytes
SHA-256: e841d07d4449d6da8ab6a964bd5caa9c8f514a3a953603d0569de730675b18c0
font_01_sfnt_off00008b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B99 19264 bytes
SHA-256: 2583ead09d95c49e848c530f0f2c78c637e23ea1d6f62696e021554800fc63cf

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