Malicious PDF — malware analysis report

Static analysis result for SHA-256 4943fef5e7c0e875…

MALICIOUS

PDF

46.5 KB Created: 2021-06-09 05:08:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: a46f42d36a75e5ff0f8363d02664fb8d SHA-1: 1f066f6e0ac18498d396bd68b7803f14e3b46d5e SHA-256: 4943fef5e7c0e87570e96413672dd32c8883423d8e33d569b6f4d10f85f33504
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors, including one specifically advertising a "Roblox Free Robux Obby Working Game Hack". The document body and heuristics suggest a lure for game-related cheats or hacks, which is a common pretext for delivering malware. The presence of embedded URLs and the redirection to suspicious domains indicate an attempt to download a second-stage payload or phish for user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://netcdn.tw/app/431946152/roblox-free-robux-obby-working-game-hack In PDF document text
    • http://lib.teknik.unimal.ac.id//repository/how-to-get-minecraft-for-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/roblox-com-robux_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/100-robux_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/coin-master-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/hack-coin-master-spin-apk_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/minecraft-logo-maker-free_GM479516143.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/coin-master-hack-download-apk_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/roblox-speed-hack-cheat-engine_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/coin-master-spin-hack-trick_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/redeem-roblox-card-free_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f01.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F01 24432 bytes
SHA-256: b445796610430d39483a9dffa88bcf7ccb965ae2c11d77601b1e34437e2b3c6b
font_01_sfnt_off000086fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86FC 2844 bytes
SHA-256: baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a
font_02_sfnt_off000090be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90BE 19044 bytes
SHA-256: 5d526685eb6880677d881f78b50fb5111ce7ae69dc72f80b0292a067cf97c289

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