Malicious PDF — malware analysis report

Static analysis result for SHA-256 96ef657b44c4ee7f…

MALICIOUS

PDF

47.5 KB Created: 2021-06-09 09:50:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fa7b4862d2f98964c1be94eee9bb6c7c SHA-1: 971e3090a8c3b556f9fb0227eb292d4fbb5d4324 SHA-256: 96ef657b44c4ee7f4e408caafa6f49949fca9bbbb23cb820a2638994e4c3abbc
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 0.9769

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.tw/app/431946152/earn-free-roblox-gift-cards-legit-game-hack PDF link annotation
    • http://www.6636.com.tw/ad6636/upload/files/roblox-trolling_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-robux-website_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/minecraft-hacked-apk_GM479516143.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-roblox-card_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/robuxmatch-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/promo-code-list-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/roblox-free-printables_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-hack-2021-no-survey_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-roblox-girl-hair-not-a-model_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/tiktok-followers-for-free_GM835599320.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/hack-in-roblox-account_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-tiktok-fans-no-verification_GM835599320.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-free-spin-and-coins-links-home_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/android-coin-master-3433-apk-hack_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004ff9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FF9 24528 bytes
SHA-256: c0796125316edfd164840e339d9f0e4c40c1aca00df61c0eab49b910e541d10b
font_01_sfnt_off00008865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8865 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off0000950d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x950D 18864 bytes
SHA-256: 13cda8f8315ac68b46e3cb945a38b0b07af800f25b58bdf73b6c4148ffca5f81

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