Malicious PDF — malware analysis report

Static analysis result for SHA-256 489efb76a083a8e3…

MALICIOUS

PDF

46.2 KB Created: 2021-05-11 20:33:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 64c54024594b227ade29434fa82d513e SHA-1: 229fa41b30d5bef4afce426b71b16e2583461f8b SHA-256: 489efb76a083a8e37b1c2ddf163ad45dd0793480a489fd9e743a60399a21dd5d
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

Heuristics 4

  • 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 https://netcdn.xyz/app/406889139/hackear-juego-coin-master-espaol-game-hack PDF link annotation
    • https://knj.com.tw/image/data/files/minecraft-pe-free-download-android_GM479516143.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/mathep_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/hack-a-game_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-ultra-attack-hack_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/free-robux-meme_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/easy-robux-today_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/toolbox-for-minecraft-pe-mod-apk_GM479516143.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-free-spins-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/roblox-hacks-and-cheats_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/easy-robux_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/roblox-games-com-free_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/wurst-112-2_GM479516143.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c96.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C96 25584 bytes
SHA-256: 15a96fdbb9f448572023496cea2c44354f5bde56d5c8aff42dc99d82d7faa5b5
font_01_sfnt_off00008767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8767 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00009152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9152 18560 bytes
SHA-256: 401325f214aca51349ad1a4a836cef9d3167637fa66b4456375b050e2f4fa365

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