Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9ec5a628ae1d0e…

MALICIOUS

PDF

33.4 KB Created: 2021-06-27 19:01:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 670cfb0ee3f6a0a8a743e314127de646 SHA-1: 047960a008ffde5fa45b60a77725a341ad368086 SHA-256: 7f9ec5a628ae1d0e64d85f51719ad4832ad1c59f0e5e2fb9b462abc556deda80
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a malformed stream and links to known malicious redirector infrastructure, specifically http://netcdn.co/app/479516143/is-minecraft-education-edition-free-game-hack. The document body and extracted URLs suggest a lure for free game hacks or generators, likely leading to further malware or phishing. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/479516143/is-minecraft-education-edition-free-game-hack In PDF document text
    • https://kldcardio.ru/images/2021-free-robux-windows-81_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/free-robloxs-birthday-cards_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/medieval-hood-of-mystery-in-roblox-free_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/roblox-anthem-hack-edition_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/free-robux-free-real_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/play-roblox-for-free-online-now_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/roblox-hack-tool-download-pc_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/free-roblox-avatar_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/free-robux-rixty-code-hack-march-2021-updated_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/coin-master-golden-cards-hack_GM406889139.pdfIn PDF document text
    • https://kldcardio.ru/images/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • https://kldcardio.ru/images/free-cool-roblox-exploits_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • https://kldcardio.ru/images/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/how-to-get-free-robux-2021-easy-on-ipad_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/how-to-hack-anyone-in-roblox_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/hack-xp-mad-city-roblox_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/robux-websites-2021_GM431946152.pdfIn PDF document text
    • https://kldcardio.ru/images/roblox-t-shirt-free-download_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
font_00_sfnt_off00002ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EF9 22020 bytes
SHA-256: 54103acf08eea7782b55840a4dd9cd385f4b0c90a574ae97a656d9d3e1cabe27
font_01_sfnt_off00005fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA1 18312 bytes
SHA-256: eecac33872f4bf99db25d0145d9acf2ab6d7270ffb9fefd56cdfeedcf9aa8f6d

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