Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ea7a5e9e3b9f51…

MALICIOUS

PDF

32.8 KB Created: 2021-07-06 11:13:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b921230e8c932b11d7d029f43e802e52 SHA-1: f5505daad84519e22bcd864a487a8a89e34c5513 SHA-256: 18ea7a5e9e3b9f51bc3de73b603a6165d64988c6e9ed817fba56e6c569c0e237
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of free Robux or game hacks. The document body explicitly contains the URL http://netcdn.tw/app/431946152/get-free-robux-gg-game-hack, which is identified as a malicious redirector. This suggests the primary goal is to drive traffic to potentially harmful websites, likely for further malware delivery or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/431946152/get-free-robux-gg-game-hack In PDF document text
    • http://slim.sisminkada.net/repository/gameoffice-net-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-robux-master_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-free-wings-avatar_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-free-spins-8-14-2021_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-cheat-enginefor-rodebix_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-apk-mod-free-download_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-2021-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-spins-coin-master-links-app_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-stuff-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-item-hack-2021_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-free-roblox-money-cheat_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/hack-robar-cuentas-de-roblox-2021-akaka-pastebin_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-generate-free-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/hacking-galaxykittty2021-on-roblox_GM431946152.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
font_00_sfnt_off00002a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A83 22240 bytes
SHA-256: 8062ef12935fbf106ccb0d171e49e60064f13120551e6d443a45769a8be82c59
font_01_sfnt_off00005c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C12 18820 bytes
SHA-256: 939eebabc2782028b138c731b49fe90b7b043b2dd7de89021f227a58667153f6

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