Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a0cbb3546eae4b1…

MALICIOUS

PDF

44.0 KB Created: 2021-06-09 03:05:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8c0600aae5b9031527f1e9a74b6404b4 SHA-1: 88c2d740d9e054768afe44ddfe82a052ee22d961 SHA-256: 4a0cbb3546eae4b170ce8a1160af3bd7a96dd26da0fe9202a96571b294dd47a8
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/free-robux-game-youtube-game-hack PDF link annotation
    • https://library.uigm.ac.id/repository/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-spin-link-in-coin-master_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/60-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-gold-cards-free-link_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-332-apk-free-download_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/pubg-uc-nasl-alnr_GM1330123889.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-heaven-links-free-spins_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/site-robux-free_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-tiktok-likes-without-verification_GM835599320.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-roblox-outfits-2021_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/legit-coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/minecraft-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/robux-free-c_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/minecraft-windows-10-key-free_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/gamehunters-coin-master_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-hack-here_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/minecraft-bedrock-download_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/minecraft-pc-free_GM479516143.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_off00004e4f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E4F 25136 bytes
SHA-256: a7ef9d385a4af6fda40b4b2d824e7d3b0510f1ea95e41d85f8548c5aecd8e2ae
font_01_sfnt_off000087c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87C2 18768 bytes
SHA-256: 8da3a6b24fcd81dc90667455eabf6a6b49ad310c8d4b6ba36b853d1572ad620e

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