Malicious PDF — malware analysis report

Static analysis result for SHA-256 58cc5ba4a546c85a…

MALICIOUS

PDF

35.3 KB Created: 2021-07-06 04:59:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8bef931c570ea361e15907bf32d69ed6 SHA-1: 2a385422cdf1eb2e77101189cbccea966a4c24d2 SHA-256: 58cc5ba4a546c85a473dd94093b54eeac214e30fe9eea0246576dcc98aab570a
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 0.9980

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 http://netcdn.tw/app/431946152/free-roblox-clothes-2021-game-hack PDF link annotation
    • http://digilib.stimlog.ac.id/repository/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-hack-apk-35-33_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/good-avator-free-20-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-toll-free-number_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/robux-redeem-card-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/pokemon-go-free-pokemon-generator_GM1094591345.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-spin-hack-trick_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/code-roblox-tokyo-ghoul-2021-free-rc_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/666-roblox-rc77-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-hack-without-verification-or-downloading-apps_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-hack-an-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-roblox-t-sirde_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/hacks-for-roblox-prison-life-v2-02_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-red-shirt-in-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-doumins-to-wear-out-of-game-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/item20212021-free-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
font_00_sfnt_off00003245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3245 22348 bytes
SHA-256: 55ab5e77d6388946b25d74d44130add3d7a16b51ac0a1f4837a31920743e1ac1
font_01_sfnt_off00006409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6409 19320 bytes
SHA-256: 86f15129a455bdcbd3c870b88480cf29a3086770cb270fee66b8f95c7ade4570

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