Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ffb2f4bd513e868…

MALICIOUS

PDF

44.0 KB Created: 2021-06-03 13:26:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b931177d95c2d9587e2c7e1cb9e570c0 SHA-1: 4c65ed1d3a264f69b0b370cda1239053767584bc SHA-256: 9ffb2f4bd513e868d03c14a8254ce90ed9ddddcdebb82291c3365ec3b3b24dee
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded URL and document body text that suggests a lure for game-related cheats or hacks, specifically mentioning 'Coin Master Daily Gifts'. The presence of an external URI and a high-confidence ML classifier flagging the PDF indicates malicious intent, likely to trick the user into downloading a secondary payload. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/406889139/coin-master-daily-gifts-game-hack In PDF document text
    • http://lib.teknik.unimal.ac.id/repository/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/coin-master-fan-page-facebook_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/toolbox-mod_GM479516143.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/clients-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/coin-free-spin_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/is-minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/coin-master-raid-hack_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/cheats-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/coin-master-card-hack-app_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/krnl-roblox_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/coin-master-hack-apk-april-12-2021_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/roblox-printables-free_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-premium-roblox_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
stream_004_off000051db.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51DB 24684 bytes
SHA-256: 3e0884cb9c612b10142e55c7efbf4bd663c161fabed3ec36bd89f7b99988e069
font_01_sfnt_off00008a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A4B 17968 bytes
SHA-256: 3c9bdffe1bb3a943d6f9365688f023e1626517f8d36d87a47424220bad3ebefc

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