Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5adbdb07bab9624…

MALICIOUS

PDF

35.4 KB Created: 2021-07-04 01:50:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 554b2c3390234c2c76502de74e6b0b19 SHA-1: 0dd06dbd3eeec6d83c5cbccf75fb5de398b4c6bd SHA-256: f5adbdb07bab9624c64bf190635de2fae0b9f85debfd989c691e07ef817e0af3
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors and lures users with promises of game hacks and free spins, indicating a phishing or scam attempt. The presence of a 'password-protected archive handoff' heuristic suggests the user is expected to download an encrypted file, likely to bypass security scanning. The primary malicious link identified is http://netcdn.tw/app/406889139/coin-master-free-spins-link-cheat-game-hack.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/406889139/coin-master-free-spins-link-cheat-game-hack In PDF document text
    • http://library.stikessuakainsan.ac.id/repository/roblox-x-ray-hack_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/parkour-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/how-to-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/coin-master-email-rewards_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/minecraft-java-free-account_GM479516143.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/cm-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/free-minecraft-account-and-password-2021_GM479516143.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/hack-avatar_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/coin-master-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/coin-master-tiradas-gratis-link_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/roblox-hack-app_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/tiktok-free-to-watch_GM835599320.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/roblox-apk-hack_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/roblox-hacks-2021-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/roblox-hackear-ninguna-encuesta_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/roblox-darkness-2-cheats_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/tiktok-free-ebooks_GM835599320.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/how-to-get-back-your-roblox-account-if-your-hacked_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/how-to-find-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/mcpe-master-hack-unlimited-coins-apk_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_002_off00003340.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3340 23128 bytes
SHA-256: a43498bc1ded20f4577119b69f5a9f8be6ce09e5d768e4dffac9bf36f94cdf57
font_01_sfnt_off00006731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6731 18512 bytes
SHA-256: 5a5a59f64de48c72dd3bef22588d8b1a643877c32e364421157886632419d7f5

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