Malicious PDF — malware analysis report

Static analysis result for SHA-256 715b1b6d0de21ee1…

MALICIOUS

PDF

47.9 KB Created: 2021-06-04 00:20:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a1be9ebf5aa40e1633251f68150f3db5 SHA-1: 12ec6702c4a4c46500cc3a58b7d891ab021452fa SHA-256: 715b1b6d0de21ee15081835a8d9ba90d3e299a9fd783e5e7d9cf2340e62b468a
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The document presents itself as a fake CAPTCHA or download lure, directing the user to a malicious URL. The ML classifier strongly indicates maliciousness, and the presence of external URIs suggests an attempt to download further payloads or redirect to a phishing site. No scripts were extracted, limiting the analysis of specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 4

  • 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/how-to-earn-free-robuxs-game-hack PDF link annotation
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/how-to-hack-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/free-coin-and-spin-link_GM406889139.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/free-robux-live_GM431946152.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/coin-master-online-hack-2021_GM406889139.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/minecraft-gun-mod-download-free_GM479516143.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/free-roblox-followers-generator_GM431946152.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/freespinandcoin_GM406889139.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/free-spins-coin-master-october-13-2021_GM406889139.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/how-to-get-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/www-robux-com_GM431946152.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/coin-master-hack-version-download-2021-android_GM406889139.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/arsenal-hacks-roblox_GM431946152.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/minecraft-pe-apk-download-free-015-0_GM479516143.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/coin-master-70-spin-link_GM406889139.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • https://digilib-bing.stkip-pgri-sumbar.ac.id/repository/hack-coin-master-xyz_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005445.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5445 25396 bytes
SHA-256: 4e7cbd6bc03671ba91bcc7a7c43766ce9e34d8d8eccd6c54b88bce99c8604901
font_01_sfnt_off00008e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E42 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off000097f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97F5 18404 bytes
SHA-256: 0d98545f28f260abef722ba3117ac8100554af1c6b36ddab7527eafac92e645c

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