Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c729298247372e2…

MALICIOUS

PDF

53.8 KB Created: 2021-06-03 14:42:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 22e9c7833a8ac48d26d3499ab11310ba SHA-1: fdbc1fed9c4cd0bd878c08bca8f91461b93374c9 SHA-256: 1c729298247372e26edaf236c88e6faa6ea753155c32c3f834de0bada9914ec1
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector infrastructure, specifically advertising a 'Coin Master Online Hack'. The document body, though partially corrupted, also contains references to this lure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_GAME_HACK_REDIRECT_LURE' strongly indicate a phishing or scam attempt designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9491

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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.online/app/406889139/coin-master-online-hack-no-human-verification-game-hack In PDF document text
    • http://e-library.akademitelkom.ac.id/repository/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/minecraft-cracked-client_GM479516143.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-cheat-codes_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-game-for-pc-free-download_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/dailyrobux_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/freegames911com-coinmastertipsandcheats2021freecoinsandspins_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-apk_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-hack-ios-no-verification_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-spin-hack-link_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/roblox-install-free_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/how-to-get-free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/earn-robux-online-free_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/paytm-to-pubg-uc_GM1330123889.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/minecraft-aimbot_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000055a3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x55A3 24792 bytes
SHA-256: 3c8104d4c2424710a6fe38b8b402e3a7ee85bce3b2efe4635973d60168a70f7d
font_01_sfnt_off00008e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E52 3560 bytes
SHA-256: 9d03f7c6c62ba3e7fdc0441e9d982a863b2b60b781165d6920512f68ecc4a440
font_02_sfnt_off00009ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AD4 8676 bytes
SHA-256: e06aca5f85e50ae6cefda302c5299c18ab6d27c174f74f0bb0ee8efa7ccb4468
font_03_sfnt_off0000af5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5E 18324 bytes
SHA-256: 134a3b787304aed0b6b676c1c78e20bf5ecb3967929c4b7a7c4fe4be2e6ca943

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