Malicious PDF — malware analysis report

Static analysis result for SHA-256 ced852ac212c7d53…

MALICIOUS

PDF

33.1 KB Created: 2021-06-29 07:21:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 85f138f2c96193ad826d50092f10cdaa SHA-1: 5f3a82538120b7c12a2abf430ffa7934a5a8dd92 SHA-256: ced852ac212c7d53f8a6de8f0f4d18783a590ed5f73140ec83067b36f136fc48
142 Risk Score

Malware Insights

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

The PDF contains numerous links to external sites, many of which are related to game hacks and generators, indicating a lure for potentially malicious content. The heuristic 'PDF_SEO_LINK_FARM' suggests a large number of such links were generated. The ML classifier also strongly flagged this PDF as malicious.

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.co/app/431946152/cheat-roblox-knife-capsules-game-hack PDF link annotation
    • https://goodtools.tw/upload/files/coin-master-free-spin-best-link_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/como-hackear-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-hack-download-ios_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-inject-cheats-roblox_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-get-free-robux-easy-no-download-2021_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-hack-on-roblox-no-email-or-no-password_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-bear-face-mask-free_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/real-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/impact-minecraft-hack_GM479516143.pdfIn PDF document text
    • https://goodtools.tw/upload/files/tiktok-freein_GM835599320.pdfIn PDF document text
    • https://goodtools.tw/upload/files/buy-robux-free_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/fly-hack-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-hack-2021-download_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/minecraft-mojang-free_GM479516143.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-hack-robux-for-free_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/hack-coin-master-spin_GM406889139.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_off00002c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C55 21784 bytes
SHA-256: b5c772329046324c31810a11d13f89d965dcd8eea576092324e70e9a7b380c2b
font_01_sfnt_off00005bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BC6 19192 bytes
SHA-256: f76108e509baee252cfae3890a3a4b0988ca4eff0824689d1f7d7888cb95628e

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