Malicious PDF — malware analysis report

Static analysis result for SHA-256 387e78ab7b4539d6…

MALICIOUS

PDF

35.0 KB Created: 2021-07-06 07:33:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 87d0ceee35a290fc026d606fe61e1e83 SHA-1: 0f0dc3dab0473606eed6326ec7610b0af3ab03e2 SHA-256: 387e78ab7b4539d66420a2c305f836a4214cdcfafbaba6ae2082582b99ad4ccd
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, including a critical redirector link to 'http://netcdn.tw/app/406889139/coin-master-bonus-game-hack', designed to lure users with game-related content. The presence of a visual download button and the overall structure suggest a phishing or scam attempt. While no scripts were explicitly extracted, the PDF's nature and embedded links strongly indicate a malicious redirection workflow.

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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-bonus-game-hack In PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/minecraft-apk-download-v1-144-2-free_GM479516143.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/how-to-hack-through-walls-on-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/minecraft-free-apk-java-edition_GM479516143.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/coin-master-free-spins-2021-apk_GM406889139.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/brick-bronze-cheats-roblox_GM431946152.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/do-robux-generators-work_GM431946152.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/btools-hack-for-roblox_GM431946152.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/codes-to-get-iooo-robux-no-hacks_GM431946152.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/comment-hacker-roblox-robux_GM431946152.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/speed-hack-assassin-roblox-2021_GM431946152.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/how-to-get-free-exotics-in-roblox-assassin-2021_GM431946152.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/cheat-engine-tricks-for-roblox_GM431946152.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/get-minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/roblox-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/free-minecraft-bedrock-server-hosting_GM479516143.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/commands-for-free-admin-for-roblox_GM431946152.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://poltekkesbanten.ac.id/e-lib/repository/how-to-get-free-robux-legit-no-human-verification_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_002_off000031d4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31D4 23248 bytes
SHA-256: e7ba18baea3a14578e769448bd3012bbefa6a11e14a3518cb106cef98fdb7919
font_01_sfnt_off00006671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6671 18192 bytes
SHA-256: 347f92f2c72f5474204f432aaed390864ecedce221811ee40a58a8bd6de89a14

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