Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd0c528210f77a2…

MALICIOUS

PDF

35.1 KB Created: 2021-07-06 10:11:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 4a3edba18acf95f82a9e6ae9182e88d0 SHA-1: 7c0421c7b0ca1731ce1c1736b4ce6accf0a189ba SHA-256: 1cd0c528210f77a24ed54943a55d3008361d1c8d7d2bb54e7b16db196f39d8bb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack lure, directing users to a known malicious redirector. The embedded URL `http://netcdn.tw/app/406889139/coin-master-hack-co-game-hack` is the primary indicator of malicious intent, likely leading to further malware or phishing. The ML classifier also strongly flagged this PDF as malicious.

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/coin-master-hack-co-game-hack In PDF document text
    • https://library.uigm.ac.id/repository/can-cheat-engine-execute-lua-c-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/one-app-rewards-free-robux_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-free-boy-clothes_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-hack-any-game-roblox_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/the-advanced-roblox-coding-book-free_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-verification_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-robux-generator_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-noclip-in-roblox-with-cheat-engine_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-cheat-in-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-how-to-hack-phantom-forces_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-hack-on-roblox-youtube_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-hack-easy-download_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/robux-hack-game_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-hack-version-2021-download_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-medieval-hood-of-mystery-free-download_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/check-cashed-v3-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/break-free-by-ariana-grande-roblox-id_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-free-spins-links-app_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_off000033b5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33B5 22980 bytes
SHA-256: 0e594db44bf033bf79b86677f2d220755511f0c208e1df1ef757ca1cc0115d31
font_01_sfnt_off00006731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6731 18004 bytes
SHA-256: 2f3a5855c5bac228d8d27cc7f61b57eebad79d58a924e470a0477843dff273c7

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