Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0e84394c99b8fb…

MALICIOUS

PDF

44.9 KB Created: 2021-05-13 07:08:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4761d65b25a2935d718d8d7c6487ca19 SHA-1: 73fd98234fc038bf63ae4002cd12e5bdf4e3d72d SHA-256: aa0e84394c99b8fb62a902dbefb18fb3e79b01f8514ea41d3c214e06eb794d47
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/coin-master-twitter-game-hack PDF link annotation
    • https://gaj.rs/images/coin-master-pc-hack-tool_GM406889139.pdfIn PDF document text
    • https://gaj.rs/images/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • https://gaj.rs/images/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://gaj.rs/images/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • https://gaj.rs/images/free-spin-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://gaj.rs/images/coin-master-free-spins-daily-link-game-mod_GM406889139.pdfIn PDF document text
    • https://gaj.rs/images/coin-master-hack-2021-free_GM406889139.pdfIn PDF document text
    • https://gaj.rs/images/robux-match_GM431946152.pdfIn PDF document text
    • https://gaj.rs/images/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • https://gaj.rs/images/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • https://gaj.rs/images/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • https://gaj.rs/images/free-roblox-card_GM431946152.pdfIn PDF document text
    • https://gaj.rs/images/50-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://gaj.rs/images/rbx-robux_GM431946152.pdfIn PDF document text
    • https://gaj.rs/images/coin-master-cheats-free_GM406889139.pdfIn PDF document text
    • https://gaj.rs/images/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • https://gaj.rs/images/coin-master-free-spinv1-0apkpure-com-apk_GM406889139.pdfIn PDF document text
    • https://gaj.rs/images/www-rbx-com_GM431946152.pdfIn PDF document text
    • https://gaj.rs/images/coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://gaj.rs/images/coin-master-game-hacks_GM406889139.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_off000048e2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48E2 24964 bytes
SHA-256: d76c956529330cae786892574e92a58d03b48ddbce3d8bfe4e7b553353bf4486
font_01_sfnt_off00008171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8171 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B23 18872 bytes
SHA-256: a56711a881c8fce30dbdf74bf894a7524435e419008a95aa49228cd0fe7748a9

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