Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be8c47a0dbaef81…

MALICIOUS

PDF

45.0 KB Created: 2021-05-17 19:07:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 428c33ea5d3298a808fe36f39ebee9b8 SHA-1: ac0b1a3bcc31d9656705f970578a97fffe9f5840 SHA-256: 3be8c47a0dbaef8151bb192944473b6c3e26a7981ea327268ad36ecf76dc606e
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 0.9632

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/how-to-hack-coin-master-ios-game-hack PDF link annotation
    • https://3qblocks.com.tw/image/data/files/coin-master--hack_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/play-roblox-free-online_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-spin-and-coin-blogspot-com_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/body-roblox_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-hack-cheat-engine_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-hack-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-app-hack_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/real-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-spin-coin-master-app-download_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-robux-no-verification-2021_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_003_off00004a90.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A90 25012 bytes
SHA-256: 033f35aa8f04a93f7867ad5aa271bfcceb639082ccf7414098991397057fba88
font_01_sfnt_off00008380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8380 3204 bytes
SHA-256: 8c2546387700f45186c395d475006178ee984eabbc175bcf1ee6eb58ba8b57aa
font_02_sfnt_off00008e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E84 17880 bytes
SHA-256: 763a279f2e0add0b56df695f97d6505090abcec5b7b78d86e36389e159d88274

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