Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf24f490afe7752…

MALICIOUS

PDF

33.3 KB Created: 2021-07-08 15:58:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5db714a7699ea83a055f803d05955846 SHA-1: 6723ec6f90c5042412ce7011af32d507e598a3a3 SHA-256: ccf24f490afe77524697599d85753eb8a2dd7ebfcc7eed18f6ba8257d8fc2783
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to a lure for a 'free generator / game hack'. The document body and embedded URLs reinforce this by advertising free downloads and hacks for popular games like Minecraft and Roblox. The malformed stream length heuristic suggests an attempt to obscure malicious content within the PDF structure.

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.tw/app/479516143/minecraft-pe-free-download-android-game-hack In PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/how-to-hack-for-money-in-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/how-to-hack-into-a-account-in-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/free-ranked-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/hack-jailbreak-roblox-2021-cranberrye_GM431946152.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/dowload-free-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/free-roblox-promo-codes-july-2021_GM431946152.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/facebook-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/how-to-get-gamepasses-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/hacker-names-for-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/free-roblox-com_GM431946152.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.man1tapin.sch.id/__statics/gudangsoal/files/minecraft-pe-apk_GM479516143.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_off000030a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30A7 20964 bytes
SHA-256: 6925826c7a7763c4f462fe7d6bdb85a62303bc9161668a9675f5e599889fd7a0
font_01_sfnt_off00005de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE7 18732 bytes
SHA-256: 1b521314cee390b0c0a345489da1d656bc9d64788a2af6148fba408b315dd9f7

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