Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb789072246397b…

MALICIOUS

PDF

34.4 KB Created: 2021-07-06 10:22:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5c09c43ac991aa2b58700e95b8bbca1c SHA-1: 4ec9adefd9978c9a734cf224f6851f76108e8063 SHA-256: 6cb789072246397b5fd598328ea1408606492fbbbeb8dc187b9e258a2ee06d0d
142 Risk Score

Malware Insights

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

The PDF document contains multiple external links, identified as a link farm, that lead to websites offering game hacks and cheats. The primary URL, http://netcdn.tw/app/406889139/free-cheat-codes-for-coin-master-game-hack, is a clear lure. The document's structure and content suggest it's designed to redirect users to potentially malicious sites, possibly for credential harvesting or malware distribution.

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/free-cheat-codes-for-coin-master-game-hack PDF link annotation
    • https://pt-mataram.go.id/perpustakaan/repository/guide--coin-master-free-tips_GM406889139.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/free-spins-coin-master-android_GM406889139.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/roblox-how-to-cheat-on-fantom-forces_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/hack-coin-master-download-ios_GM406889139.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/free-clothes-on-roblox-catalog_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/free-roblox-accounts-with-robux-september-2021_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/how-to-use-redstone_GM479516143.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/free-minecraft-account-reddit_GM479516143.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/free-minecraft-skin-packs_GM479516143.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/murder-mystorys-roblox-knife-hack_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/free-code-robux-2021_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/pokemon-go-free-007_GM1094591345.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/roblox-hack-electric-state_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/roblox-robux-pastebin-hack-2021_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/minecraft-hacks-ps4_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
stream_002_off00002ff9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FF9 23024 bytes
SHA-256: 11f5a614958d7bbf1571db9a117afa739ffc2b86435b39fe6e928fd5a8b0722c
font_01_sfnt_off00006398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6398 18336 bytes
SHA-256: 8a9bc7abd189acaaaac2c7f4302e273a50883f1c324e9de9a82b6148b49a4290

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