Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9126574f8f50a97…

MALICIOUS

PDF

35.4 KB Created: 2021-07-03 22:33:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7e606e498b2cc9b413811e3b0c39993e SHA-1: 2763906ddef8199debc88564a97c17d6466494f9 SHA-256: f9126574f8f50a97de88564ec4dfe2f9febd09352e3a1db631f77b2566a08797
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to a known malicious redirector, disguised as a 'Coin Master Hack'. The document body and heuristics indicate a lure for users to click these links, likely leading to further malicious content or downloads. 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-spins-and-coins-unlimited-free-game-hack In PDF document text
    • http://lib.untad.ac.id/repository/roblox-money-hack-amd-city-2021_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-rthro-packages-roblox-list_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-change-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/pubg-uc-wholesale_GM1330123889.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-hack-funnehcake-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/hack-client_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-hack-roblox-life-in-paredise_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/cheats-for-royale-high-school-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-toy-codes-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-buy-headless-head-in-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/get-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-roblox-game-icons_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-wall-hacks_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/coin-master-free-gift-links-2021_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-hack-generator-secret_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/assassin-roblox-free-exotic_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/minecraft-free-online_GM479516143.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_off000031a3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31A3 23104 bytes
SHA-256: 902806cbc090f2ae2f66f2d4c11b76337d07fafcdbc2a72214c565bb345f441c
font_01_sfnt_off000065b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65B7 19036 bytes
SHA-256: 210ffa2b1257eecc61bc0a96a8b024f9d7cb0b9b85e8dcb329e8b8773fbc43e7

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