Malicious PDF — malware analysis report

Static analysis result for SHA-256 778a5120d9f0ec4b…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 23:04:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: faaa732cf4cd4856b7409080de3b6dd0 SHA-1: 4eb1dfbbcc6758df249282559ab6bce92488e033 SHA-256: 778a5120d9f0ec4b168c2251c78733883e7d13d2b99949cf6133c0bf30beaa67
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high-severity heuristic indicating it links to a game hack redirector, specifically http://netcdn.tw/app/406889139/mcpe-master-free-coins-game-hack. The document body, though partially garbled, also contains this URL and other similar lures for game-related cheats and hacks. This suggests the primary purpose is to trick users into visiting a potentially malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/mcpe-master-free-coins-game-hack In PDF document text
    • http://lib.unar.ac.id//repository/free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/free-spins-for-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/coin-master-spin-hack-trick_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/how-many-levels-are-there-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/how-to-get-free-robux-on-roblox-pc-2021_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/minecraft-client-download_GM479516143.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/free-games-like-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/coin-master-hack-ios-cydia_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/google-roblox-games_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/roblox-free-hair-girl_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/coin-master-apk-mod-free-download_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/easypoints-gg-roblox_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/coin-master-hack-iphone_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/how-to-get-a-dominus-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/hacker-minecraft-song_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
stream_002_off00003213.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3213 23212 bytes
SHA-256: 65a6f6b8453bfdaa599dde2199f439e4dd0734e561b390d8c29c88779e6144bb
font_01_sfnt_off00006631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6631 18176 bytes
SHA-256: 1693082916f189875d4d64fe848321ecd7215bfa80120e82d4d23c7be60bd4f3