Malicious PDF — malware analysis report

Static analysis result for SHA-256 81fd00930b0c3748…

MALICIOUS

PDF

34.5 KB Created: 2021-06-22 00:41:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8f26b5dda0c42c64e779e7ff146500d4 SHA-1: d5c821c085d59340f07dab84f565f96448a29530 SHA-256: 81fd00930b0c3748db57250c6a51541146543c709c53d70d13543c61c7c85857
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure for free in-game currency or hacks, directing users to a malicious redirector URL. The document's content and embedded links strongly suggest a phishing or scam attempt designed to trick users into visiting potentially harmful sites. No scripts were extracted, but the presence of malicious redirectors and numerous download-related URLs indicates a high likelihood of further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/how-to-get-free-robux-on-iphone-game-hack In PDF document text
    • https://nexsoftech.com/upload/userfiles/files/roblox-2021-hack_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/coin-master-apk-hacked-3526_GM406889139.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/coin-master-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/coin-master-hack-game-download_GM406889139.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/free-robux-please_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/free-robux-email-account_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/hack-for-roblox-a-bizzare-day_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/facebook-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/coin-master-free-spins-link-2021-no-verification-deutsch_GM406889139.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/how-to-get-free-wings-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/games-like-coin-master_GM406889139.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/roblox-a_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/free-robux-wings_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/coin-master-daily-spin-link-app_GM406889139.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/roblox-g_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EB6 22568 bytes
SHA-256: d138e7ddde57463e9d6bac08185b10f4186f16a267004de842baab6e727f5c51
font_01_sfnt_off000060df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60DF 19328 bytes
SHA-256: 611facc0ebe53277e6875418a9080e29f4818c8822afe77d04b044b7175153fa

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