Malicious PDF — malware analysis report

Static analysis result for SHA-256 87087dbad7d5a385…

MALICIOUS

PDF

34.6 KB Created: 2021-07-04 00:16:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: feae84bf6131276c468750abeb76afae SHA-1: aca816d5db947f37dffce84dce5f41d50c705ca3 SHA-256: 87087dbad7d5a3850568c3013e885bc30eded29f4bb5d3fb7e610b65ec051c56
160 Risk Score

Malware Insights

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

This PDF document contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.tw/app/479516143/minecraft-java-server-hosting-free-game-hack. The document body and heuristics suggest a lure for game hacks or cheats, likely intended to lead the user to download further malicious content or exploit a vulnerability. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/479516143/minecraft-java-server-hosting-free-game-hack In PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/survival-games-roblox-cheats_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/best-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins--coins-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-cheats-in-roblox-jailbreak-yt_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/chronosploit-roblox-hack_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-apk-hack-mod-download_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/chisel-and-bits-mod-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/what-is-exploiting-in-roblox_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-hack-into-admin-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-wurst_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-hack-channel-art_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-java-free-account_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/wwwroblox-cheatgdn_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-rewards-robux_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_off00003255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3255 22604 bytes
SHA-256: d3c2008f4bb6a70c0133dcaf4946d5c4f51f3628e8cf8cf3f005721581217dae
font_01_sfnt_off000064d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64D9 18276 bytes
SHA-256: 5e44962821fb2565cfe95a9f549b7a0fbd0587c00345fc69eb3db563df392af4

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