Malicious PDF — malware analysis report

Static analysis result for SHA-256 71373209ed99c704…

MALICIOUS

PDF

45.1 KB Created: 2021-06-03 23:23:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b94c1a6876cd6c30562f26d2abb983c6 SHA-1: deaefed89041d4d445ea73dfc35b6daac8b197dc SHA-256: 71373209ed99c704724c7fc474d84af30dcf04b3a88f29446f50ee49876eda11
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.online/app/431946152/roblox-jailbreak-hack-download-game-hack PDF link annotation
    • http://library.stikessuakainsan.ac.id/repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/free-roblox-girl-hair-not-a-model_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/free-robux-picture_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/how-to-get-free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/oprewards-points-generator_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/coin-free-spin_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/coin-master-daily-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/pubg-uc-zain_GM1330123889.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/how-can-i-get-free-coinsn-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/pubg-uc-quiz_GM1330123889.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/get-robux-com_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/free-spins-coin-master-links-blogger_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/give-me-robux-now_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/50-000-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id//repository/is-free-robux-real_GM431946152.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/getrobux-ninja_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_004_off00005042.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5042 25528 bytes
SHA-256: 26e102f832964304c0171ca70b8e731d39bee17716ed150c5c9d911b63b46407
font_01_sfnt_off00008b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B87 18972 bytes
SHA-256: 261da8cecf88d9fe7cdfdd42a26ac06d4c96d8a11aebf729db611f6a559eb8d5

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