Malicious PDF — malware analysis report

Static analysis result for SHA-256 009f37c48b1d4325…

MALICIOUS

PDF

33.6 KB Created: 2021-07-06 16:09:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 27e1a7e07e8ec7162c92bda52015008b SHA-1: 90da3de1f0dd55496012c67e98a2963ddc8cb72a SHA-256: 009f37c48b1d4325740d8968121e2b2f5b9023328e6dbf9369115e6944132cd6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting game hacks and free currency generators. The primary lure URL, http://netcdn.tw/app/406889139/hack-coin-master-1-game-hack, is identified as a malicious redirector. The presence of a 'download button' heuristic further supports the lure's intent to trick users into clicking malicious links.

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/hack-coin-master-1-game-hack In PDF document text
    • http://www.elibrary.perludem.org/repository/cheat-roblox-mad-city-kick_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-quick-generator_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-email_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-5-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/mcpe-hack-client_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/game-give-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-get-free-robux-in-roblox-2021-proof_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-games-for-free-for-kids_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/hack-robux-work_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/all-roblox-eggs-2021-hack-pastebin_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/cheat-roblox-windows-10_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-skin-editor-free_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-cheats-for-robux-and-tix-no-survey_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-hack-robux-unlimited-free-on-android-ios-100-working_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/bloodborne-roblox-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-printable-roblox-birthday-card_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/do-you-get-ip-banned-in-roblox-if-you-hack_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-cheats-2021-ios_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-coins-for-coin-master_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_off00002c90.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2C90 23100 bytes
SHA-256: a7d5c4edba9aabfe627d0e670c2ebfedd4e6e36166c7ec7116313adc2ed8c037
font_01_sfnt_off000060ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60EE 18112 bytes
SHA-256: 8798f2c46357f6d617dd0237e320daff08fbf1961369e9d230ff020b883162dd

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