Malicious PDF — malware analysis report

Static analysis result for SHA-256 de6321ad1c63227e…

MALICIOUS

PDF

42.6 KB Created: 2021-05-12 19:32:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 98e9618479da7baa2b59d58c76aee861 SHA-1: 2d7c56ee50533ec9b43742906054a93021712dd1 SHA-256: de6321ad1c63227e0163e90078d1455cf816a4dbfb303b5e6501d4fd56722e34
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF contains a malformed stream and links to known malicious redirectors, specifically advertising a 'Coin Master Card Hack'. The ML classifier strongly indicates maliciousness. The document's intent is to trick users into clicking these links, likely to download further malware or engage in phishing. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/406889139/coin-master-card-hack-apk-game-hack In PDF document text
    • http://www.chitfund.com/uploaded_files/userfiles/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://chitfund.com/uploaded_files/userfiles/files/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • https://chitfund.com/uploaded_files/userfiles/files/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.chitfund.com/uploaded_files/userfiles/files/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • https://chitfund.com/uploaded_files/userfiles/files/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://chitfund.com/uploaded_files/userfiles/files/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • https://chitfund.com/uploaded_files/userfiles/files/free-minecraft-java-account_GM479516143.pdfIn PDF document text
    • https://chitfund.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • http://www.chitfund.com/uploaded_files/userfiles/files/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • http://www.chitfund.com/uploaded_files/userfiles/files/how-to-get-free-spins-grom-coin-master_GM406889139.pdfIn PDF document text
    • https://chitfund.com/uploaded_files/userfiles/files/minecraft-bedrock-free-with-java_GM479516143.pdfIn PDF document text
    • https://chitfund.com/uploaded_files/userfiles/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://chitfund.com/uploaded_files/userfiles/files/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://chitfund.com/uploaded_files/userfiles/files/free-roblox-animations_GM431946152.pdfIn PDF document text
    • https://chitfund.com/uploaded_files/userfiles/files/coin-master-hack-no-verification-ios_GM406889139.pdfIn PDF document text
    • http://www.chitfund.com/uploaded_files/userfiles/files/robux-game_GM431946152.pdfIn PDF document text
    • http://www.chitfund.com/uploaded_files/userfiles/files/coin-master-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://www.chitfund.com/uploaded_files/userfiles/files/doctor-louie-roblox_GM431946152.pdfIn PDF document text
    • http://www.chitfund.com/uploaded_files/userfiles/files/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • http://www.chitfund.com/uploaded_files/userfiles/files/june-29-coin-master-hack-no-human-verification_GM406889139.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_off000048e8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48E8 25892 bytes
SHA-256: 77ab6d223587404c0b8892a18868c7bd7295f652335d5bea297bf08141677d18
font_01_sfnt_off00008494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8494 18068 bytes
SHA-256: 253c022fea36e2edfdded8e932a5d2c5ace7c2c75107348eb73538d72e63084f

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