Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2fd5d43074345a0…

MALICIOUS

PDF

32.8 KB Created: 2021-07-05 15:58:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8897eab8bf3ce5abf9010b4fd6ae0b98 SHA-1: 40e43b2f2aa0ed90ea04a36eee65205383028800 SHA-256: b2fd5d43074345a0a6d929bf715db07fd6da80f63a67b62e5b43338c5c7ae34b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.tw/app/431946152/roblox-girl-avatar-game-hack. This lure is designed to trick users into believing they can access game hacks or generators, likely leading to further malicious content or downloads. The ML classifier also strongly indicated maliciousness.

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/roblox-girl-avatar-game-hack In PDF document text
    • http://library.ulb.ac.id/repository/roblox-admin-hack-mega_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/crazy-lion-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-robux-nicsterv-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/mad-city-roblox-free-car-volcano_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-roblox-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-robux-for-cumputer_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/minecraft-login-free_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/hack-coin-master-game-download_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/robloxhacks_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-skins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/rewards-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-free-play-no-download_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/earn-free-robux-now_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-work-at-a-pizza-place-cheat_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/why-doesnt-roblox-play-with-cheat-engine-on_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/hacked-roblox-client-windows-10_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/games-with-free-segway-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_off000029dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29DD 22312 bytes
SHA-256: f16a435d9f6f36bc07b46ff134389b5550c98440ba5a73c1b22d514cd8e321dc
font_01_sfnt_off00005bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BC7 18824 bytes
SHA-256: a049bc211159218bd83ce46d7963f6a91c240f948409f01e9ddd8b42dda3a560