Malicious PDF — malware analysis report

Static analysis result for SHA-256 beda2e30b26baea4…

MALICIOUS

PDF

44.7 KB Created: 2021-06-03 06:21:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6fb6f001a5a720b1647cb96f223a85b2 SHA-1: 780057f3a95faf7ba512ed13f9871888710099ee SHA-256: beda2e30b26baea49aa4c82d77ba51d1d553230fab3dfe30ef6faac289450d2e
200 Risk Score

Malware Insights

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

The PDF document contains a link that redirects to a known malicious infrastructure, disguised as a 'free generator / game hack'. The document also displays a fake CAPTCHA or human verification prompt, intended to trick the user into interacting with the malicious link. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector link indicates a likely attempt to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.online/app/479516143/minecraft-iphone-free-game-hack In PDF document text
    • https://digilib.darmajaya.ac.id/repository/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/free-minecraft-server-maker_GM479516143.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/mcpe-optifine_GM479516143.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/coin-master-hack-2021-iphone_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/roblox-avatar-free_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/free-cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/coin-master-free-attack-hack_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/pop-slots-free-vegas-casino-slot-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/freer-tiktok_GM835599320.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/free-coin-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/legit-coin-master-hack-october-2021_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/how-to-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/minecraft-free-ios_GM479516143.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/games-on-roblox-that-actually-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/robuxhub-net_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
stream_004_off0000555e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x555E 24804 bytes
SHA-256: 4882b5b673d93b35016e0eb1a236781cf98218fa3d0e7e6470eb4ad1d6f7c0fa
font_01_sfnt_off00008cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CFA 18052 bytes
SHA-256: d64526d0e07d457868d5eac688c0bc3e5c9817b8b07646f1be3e20c76e1ff486

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