Malicious PDF — malware analysis report

Static analysis result for SHA-256 38831342c4af3645…

MALICIOUS

PDF

33.6 KB Created: 2021-07-06 09:57:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5818579b394dbb0a990d79b9f726414c SHA-1: 1c9ef4363ea261b55407546dd168c590c91b0f03 SHA-256: 38831342c4af3645db49b5ce082c60d6fb377ef9cda871665c3db852dbf93225
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains numerous links designed to lure users into clicking on them under the guise of game hacks and free currency generators. The heuristic findings indicate a 'PDF SEO Link Farm' and a 'Game Hack Redirect Lure', strongly suggesting the document's purpose is to drive traffic to malicious or deceptive websites. While no scripts were explicitly extracted, the nature of the links and the ML classification point towards a malicious intent to exploit user interest in game cheats.

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/how-to-hack-coin-master-game-hack PDF link annotation
    • http://lib.vipklh.ru/repository/mcpe-master-unlimited-coins-hack-apk_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-i-want-to-break-free_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-server-hack_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/atticus129-roblox-profile-hacked-account_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/hacking-app-for-hacking-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/denisdaily-hacking-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-spins-generator-no-verification_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-spins-october-28-2021-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-games-com-free_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/minecraft-apk-free-download-016-0_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-34-6-hack_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/denisdaily-exposing-a-roblox-hacker_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/earn-robux-sites_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-coins-free_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_off00002d6c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2D6C 22884 bytes
SHA-256: 1176b51e988d0dabfd2babded4684a43c6c0173b60242f0f7fdd8feee0d47f57
font_01_sfnt_off000060a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60A3 18168 bytes
SHA-256: 2bd458773159c42ddb973016f08b2d4d6bea9039625adade8827a8f393a5a95a

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