Malicious PDF — malware analysis report

Static analysis result for SHA-256 73cbc10d5fb0e050…

MALICIOUS

PDF

42.0 KB Created: 2021-05-11 02:04:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 31597a40bf48fd027db5af772b7193f2 SHA-1: fb2c7abf2e461de7a507eeefa6a2679824653b80 SHA-256: 73cbc10d5fb0e0506d4dcb98824dd176cf255fb4c1b7d0254ff0bacf3ff6b02c
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 0.9971

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/431946152/free-robux-legit-game-hack PDF link annotation
    • http://katalog.gemalibrary.net/repository/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/8bp-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/moon-active-games_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/wwwcoin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-gift-link-hack_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-minecraft-skins-java_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-ios-hack_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/minecraft-reach-hack_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/best-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-apk-hack-download_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/mcpe-master-hack-coin-apk_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-free-spins-link-whatsapp-group_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/aimbot-exe-roblox_GM431946152.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
stream_003_off000048bc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48BC 25228 bytes
SHA-256: 5d03d81c20822969577c99dfec3ec578d45742fe8f92555aa1bab455e7ae9104
font_01_sfnt_off000080cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80CD 18528 bytes
SHA-256: aa02e962ea97e6ca8489eff7fd27dc9c81bb0b76c5ed523337a23ffa677521ed

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