Malicious PDF — malware analysis report

Static analysis result for SHA-256 d20eb417c854b5f1…

MALICIOUS

PDF

34.6 KB Created: 2021-07-04 23:47:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0e465fe9473a7fa89df60beebbcc6070 SHA-1: d242e46be02666a25873ab6a7ad62f70eaa563b8 SHA-256: d20eb417c854b5f16f94e5f00906bec59dabf1b79f9ab42f4438a3fd0d3e8a4e
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF document contains lures for game hacks and rewards, directing users to external URLs. One primary URL, http://netcdn.tw/app/431946152/roblox-microsoft-rewards-game-hack, appears to be a redirector. The document also hosts a large number of SEO-optimized PDF links on malungtreks.com, indicating a link farm designed to drive traffic or potentially distribute further malicious content.

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/431946152/roblox-microsoft-rewards-game-hack PDF link annotation
    • https://malungtreks.com/userfiles/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/roblox-hacked-accounts-list_GM431946152.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/is-there-a-way-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/coin-master-free-spins-fb-champion_GM406889139.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/tiktok-free-like-app_GM835599320.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/free-coin-master-app_GM406889139.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/get-free-spins-on-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/blox-fun-info_GM431946152.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/coin-master-cheat-codes-free_GM406889139.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/free-robux-generator-no-human-verification-fpr-real_GM431946152.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/how-to-hack-minigame-testing-place-on-roblox_GM431946152.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/coin-master-free-spins-link-2021-blogger_GM406889139.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/minecraft-mod-menu-apk_GM479516143.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://malungtreks.com/userfiles/files/minecraft-fly-hack_GM479516143.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_off00002ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EAD 22540 bytes
SHA-256: 27428553890883d50494f5efb8448f9ed347ea10b93e28aad80141a48f048ca0
font_01_sfnt_off00006153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6153 19244 bytes
SHA-256: f8bb3a80441ad8ed23a4594754ddb52409a0eb1a5dd42708402faee16d247a69

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