Malicious PDF — malware analysis report

Static analysis result for SHA-256 4175ba43c7a9d578…

MALICIOUS

PDF

36.0 KB Created: 2021-07-06 03:35:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7beb5750c54cccf0a2a8050b903d92b0 SHA-1: e02b2933ad96bb632d687a3d5c14ef225172dcf1 SHA-256: 4175ba43c7a9d5781b6f0a0834a40b9e238d10ef07fb8f08cb6df621536b2f5d
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are disguised as game hacks or cheats for popular games like Roblox and Coin Master. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a link farm or SEO manipulation tactic. The primary URL, http://netcdn.tw/app/406889139/coin-master-cheat-apk-free-download-game-hack, is directly associated with a game hack lure. This pattern is commonly used to trick users into downloading malicious files or visiting compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 http://netcdn.tw/app/406889139/coin-master-cheat-apk-free-download-game-hack PDF link annotation
    • https://fud.iain-surakarta.ac.id/pustaka/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • https://fud.iain-surakarta.ac.id/pustaka/repository/roblox-hack-apk-download-unlimited-robux-ios_GM431946152.pdfIn PDF document text
    • https://fud.iain-surakarta.ac.id/pustaka/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://fud.iain-surakarta.ac.id/pustaka/repository/roblox-nopde-engine-hacks_GM431946152.pdfIn PDF document text
    • https://fud.iain-surakarta.ac.id/pustaka/repository/roblox-how-to-get-free-items_GM431946152.pdfIn PDF document text
    • https://fud.iain-surakarta.ac.id/pustaka/repository/download-roblox-free-on-the-apple-store_GM431946152.pdfIn PDF document text
    • https://fud.iain-surakarta.ac.id/pustaka/repository/mcpe-master-hack-unlimited-coins-latest-version_GM406889139.pdfIn PDF document text
    • https://fud.iain-surakarta.ac.id/pustaka/repository/how-to-play-coin-master_GM406889139.pdfIn PDF document text
    • https://fud.iain-surakarta.ac.id/pustaka/repository/roblox-superhero-simulator-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • https://fud.iain-surakarta.ac.id/pustaka/repository/free-premium-roblox_GM431946152.pdfIn PDF document text
    • https://fud.iain-surakarta.ac.id/pustaka/repository/free-roblox-com_GM431946152.pdfIn PDF document text
    • https://fud.iain-surakarta.ac.id/pustaka/repository/hacked-roblox-shirts-that-work_GM431946152.pdfIn PDF document text
    • https://fud.iain-surakarta.ac.id/pustaka/repository/how-to-advertise-roblox-games-for-free_GM431946152.pdfIn PDF document text
    • https://fud.iain-surakarta.ac.id/pustaka/repository/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://fud.iain-surakarta.ac.id/pustaka/repository/pokemon-go-free-egg-incubator_GM1094591345.pdfIn PDF document text
    • https://fud.iain-surakarta.ac.id/pustaka/repository/minecraft-114-download_GM479516143.pdfIn PDF document text
    • https://fud.iain-surakarta.ac.id/pustaka/repository/i-hacked-in-to-roblox-and-found-this-mystery-box_GM431946152.pdfIn PDF document text
    • https://fud.iain-surakarta.ac.id/pustaka/repository/how-to-get-free-robux-easy-on-ipad_GM431946152.pdfIn PDF document text
    • https://fud.iain-surakarta.ac.id/pustaka/repository/http-wwwrobux-hack_GM431946152.pdfIn PDF document text
    • https://fud.iain-surakarta.ac.id/pustaka/repository/multiplayer-master-hack-coins_GM406889139.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_off00003313.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3313 23268 bytes
SHA-256: 25a8df53b5e4f1d8e3b7a037037d48d6391a568af20f7030037ccb9707fba24f
font_01_sfnt_off000067bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67BD 19092 bytes
SHA-256: 49edf52c5cf368a8d41ab1b9b283a900cdd060b2dfdd3a58fc5bfb308b9a1ed9

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