Malicious PDF — malware analysis report

Static analysis result for SHA-256 439c378e435c3de2…

MALICIOUS

PDF

35.1 KB Created: 2021-07-05 22:03:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 23604e5ea3e3fb0d33f8583c241b834e SHA-1: 9b77f86709c375e0bf358bbb6f8756f214c302f4 SHA-256: 439c378e435c3de273ce526c4114d06008acf69f7fea6ef4ae25d4eb01616471
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically advertising "free generators" and "hacks" for popular games. The primary malicious URL identified is http://netcdn.tw/app/406889139/legit-coin-master-hack-no-human-verification-game-hack. This lure is designed to trick users into clicking, likely leading to further malware downloads or phishing attempts. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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/legit-coin-master-hack-no-human-verification-game-hack In PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-obby-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spin-today-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-spins-android_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/robux-earning-sites_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-hack-blog_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-hack-coin-master-ios-no-jailbreak_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/is-minecraft-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-java-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-vehicler-simulator-afk-money-hack_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/haktutsin-2021-09-coinmaster50freespinandcoinlinkhtml-m-1_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_off0000317f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x317F 23224 bytes
SHA-256: 83bec8957d488f4a2a64802dd7fdfebf2c297ec80ce2492c2883d643bd591c82
font_01_sfnt_off000065ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65EE 18540 bytes
SHA-256: 944ef90ac3957acf4ab0155e17f54942f1cad929ef859b36db5d7006f4b781e4

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