Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ffc77603382aec7…

MALICIOUS

PDF

43.3 KB Created: 2021-06-03 06:54:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 7b30caa5f733dfa104681d6f35c57f27 SHA-1: 4a13aa379c882ee14741b56e46b2b430cbaaef4b SHA-256: 1ffc77603382aec73db4b6a2e4573baa5c050e23c80b7230ff0d14ec2c7240b0
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a malformed stream and links to known malicious redirector infrastructure, specifically promoting a 'free generator / game hack' lure. The embedded link directs users to 'https://netcdn.online/app/406889139/how-to-get-free-spins-grom-coin-master-game-hack', which is likely intended to lead to a further malicious download or phishing page. The document body and heuristics indicate a social engineering attempt to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/how-to-get-free-spins-grom-coin-master-game-hack In PDF document text
    • http://perpus.masda.ac.id/repository/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-do-i-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-free-spin-today-2021_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-win-attack-madness-in-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/tiktok-free-hearts-hack_GM835599320.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-minecraft-java-code_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/wizard-hacks_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-apk-mod-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/roblox-place-rewards_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/ultimate-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/near-tiktok-free-view_GM835599320.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-free-spins-2021-app-download_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-get-free-spins-on-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-robux-videos_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/pig-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-get-more-spins-on-coin-master-hack_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_004_off00005036.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5036 23940 bytes
SHA-256: 6e9be0a22bc4a921b39f68afa78fa915d2a8f60ade69b544877acc434048eab6
font_01_sfnt_off00008690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8690 18308 bytes
SHA-256: 54bc4cb339ab54a414e81dbc8c78cd983f23e840174d14985084a71892f993b4

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