Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd142a38d984d34…

MALICIOUS

PDF

44.8 KB Created: 2021-06-09 12:48:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 49ec10b3fc959cfede82e79447c155a2 SHA-1: df30f5d4c9cce3bb54b087255217a8f05a7b4099 SHA-256: 4dd142a38d984d34e286d9ee3f6f36b3d5184bbb839b0fbf58aa7793c4db68b2
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 0.9865

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.tw/app/431946152/deadly-sins-online-roblox-hack-game-hack PDF link annotation
    • http://library.ulb.ac.id//repository/free-roblox-hair-to-wear_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-free-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-attack-hack-apk_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-hack-xyz-2021_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-free-pets_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/202100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/pasos-para-hackear-coins-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/hack-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-do-i-log-into-my-hacked-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/hack-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-hacks-for-free-spins_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coinmaster-hack_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-dominus-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-heaven_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-btools-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/get-robux-com_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-coin-master-hacks-no-verification_GM406889139.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_004_off00005103.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5103 24836 bytes
SHA-256: bcf37ab27fb6d573f4bf5be0b3086f484a2f50c66cec9ff0d4c94c6b027375b6
font_01_sfnt_off00008aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AAA 18824 bytes
SHA-256: e9c8e37e7882c62076c0e6d6c23d04050bba416e1384a94070120008d1d8563b

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