Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a6ef3d35c8c9831…

MALICIOUS

PDF

46.1 KB Created: 2021-06-11 02:59:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 1e799c2fa56eef9ad39888933a0f94c8 SHA-1: 240183abfec2e5229224b2a696d1f7e91687b916 SHA-256: 1a6ef3d35c8c9831a04de2bdce2619e37a77301482c2b67522d3d3e58adbb378
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free generators' and 'game hacks' for popular games. The document also contains an instruction to disable security software, which is a strong indicator of malicious intent. The primary lure appears to be a fake generator for Roblox items, directing users to the `netcdn.tw` domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.tw/app/431946152/roblox-how-to-get-free-limited-items-game-hack In PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-spins-link-2021-no-verification-deutsch_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/today-coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/tiktok-free-like-app_GM835599320.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-free-download-android-apk-014-0_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/free-coin-spin-daily-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-raid-link_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/mc-hacks_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-cheats-deutsch-pc_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/www-coin-master-hack-com_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/hack-de-robux-rapido_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_off0000527f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x527F 26456 bytes
SHA-256: 64677dbd489cc6d5c82ced2a99dff7c2df3f85c112fe72d9d39be339fcbc5b98
font_01_sfnt_off0000903e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x903E 18772 bytes
SHA-256: 4fcfc04c279b7f610a026ffdb802da1bc9cf357c4932813a59128daf39705f3b

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