Malicious PDF — malware analysis report

Static analysis result for SHA-256 552731af9526a2df…

MALICIOUS

PDF

41.1 KB Created: 2021-05-16 13:32:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 76c1e810377aa13da29c48a4000b041e SHA-1: 662700e758c09a426820899138b87e15431f571d SHA-256: 552731af9526a2dff1012c919defe62fe6552a287c0f0ab0a2e3dcbb46941019
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a malicious redirector link disguised as a game hack generator, aiming to trick users into downloading a payload. The presence of multiple related PDF files hosted on the same domain suggests a campaign distributing potentially malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

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/descargar-hack-coin-master-game-hack In PDF document text
    • https://msbrijuniversity.ac.in/ckfinder/userfiles/files/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • https://msbrijuniversity.ac.in/ckfinder/userfiles/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • https://msbrijuniversity.ac.in/ckfinder/userfiles/files/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • https://msbrijuniversity.ac.in/ckfinder/userfiles/files/e-free-roblox_GM431946152.pdfIn PDF document text
    • https://msbrijuniversity.ac.in/ckfinder/userfiles/files/get-robux-today_GM431946152.pdfIn PDF document text
    • https://msbrijuniversity.ac.in/ckfinder/userfiles/files/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://msbrijuniversity.ac.in/ckfinder/userfiles/files/can-i-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://msbrijuniversity.ac.in/ckfinder/userfiles/files/coin-master-free-spins-today-new_GM406889139.pdfIn PDF document text
    • https://msbrijuniversity.ac.in/ckfinder/userfiles/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://msbrijuniversity.ac.in/ckfinder/userfiles/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • https://msbrijuniversity.ac.in/ckfinder/userfiles/files/earn-roblox_GM431946152.pdfIn PDF document text
    • https://msbrijuniversity.ac.in/ckfinder/userfiles/files/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://msbrijuniversity.ac.in/ckfinder/userfiles/files/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • https://msbrijuniversity.ac.in/ckfinder/userfiles/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://msbrijuniversity.ac.in/ckfinder/userfiles/files/good-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://msbrijuniversity.ac.in/ckfinder/userfiles/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • https://msbrijuniversity.ac.in/ckfinder/userfiles/files/minecraft-pocket-edition-download-free-pe-calculator_GM479516143.pdfIn PDF document text
    • https://msbrijuniversity.ac.in/ckfinder/userfiles/files/how-to-use-wurst_GM479516143.pdfIn PDF document text
    • https://msbrijuniversity.ac.in/ckfinder/userfiles/files/minecraft-free-download-android-apk-014-0_GM479516143.pdfIn PDF document text
    • https://msbrijuniversity.ac.in/ckfinder/userfiles/files/free-robux-generator-com-roblox-hack_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_off00004762.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4762 24124 bytes
SHA-256: b76433503eaaa35b28f8b576068831713fd34486be2fdd52420c6fd16aa679db
font_01_sfnt_off00007e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E51 18172 bytes
SHA-256: 8e05f9f32595a35b5a9f3361bee3fb11860dee14ab597e5c6e5f24d8016f84fd

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