Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff73956a731ed12…

MALICIOUS

PDF

49.9 KB Created: 2021-06-09 07:37:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ac2cfb72e8be0465d16847a8dc109291 SHA-1: e5ba949699f6018048edcc7170e5083e38531a5e SHA-256: dff73956a731ed123566849ad74cba0f72d54b8d2f71a8947993bb8957ddd56a
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high-severity heuristic indicating it links to a game hack lure, specifically targeting Roblox users. The embedded URL, https://netcdn.tw/app/431946152/hacking-someones-account-roblox-game-hack, likely leads to a malicious site designed to trick users into downloading further malware or revealing credentials. Although no scripts were explicitly extracted, the nature of the lure and the ML classification suggest a malicious intent to exploit user interest in game cheats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/hacking-someones-account-roblox-game-hack PDF link annotation
    • http://zercalo.org/images/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/free-minecraft-mods_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/free-hoverboard-roblox-mad-city_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/roblox-jailbreak-speedhack-cheat-engine_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-now-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/roblox-free-skin_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/roblox-free-hats_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/hack-game-roblox_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-spin-link-for-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-free-install_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-coins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/password-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050ab.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50AB 25676 bytes
SHA-256: dceae4376fad26951a8ff13a39a4cc804a786523d8449e72daa03d10c7d30825
font_01_sfnt_off00008c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C2C 7448 bytes
SHA-256: a76ff9b4805dcff342f7268a16e2e3c2ff2b31b96c381fe4deb6ceea777bce90
font_02_sfnt_off00009e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E0F 19092 bytes
SHA-256: 096fec7a8e4cc3c813a85784f46be38deaa6f8c00405f63ce1079c1eb077377c

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