Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a671c5a54efbcc7…

MALICIOUS

PDF

44.8 KB Created: 2021-06-04 03:12:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 43349699280ca6431cbb7d4be16a0f99 SHA-1: 7f651a7a26e6136295774065d2834e582de85fc4 SHA-256: 1a671c5a54efbcc7a410846265b4245f3159ba1e6330200b7360f0b99fae2739
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The document presents a fake CAPTCHA to trick the user into interacting with it, likely to initiate a download. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent. The document's content and embedded URLs suggest a lure for free in-game currency or software, a common tactic for distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/earn-free-robux-game-hack PDF link annotation
    • http://lib3tell.stptrisakti.net/repository/minecraft-java-edition-free-download-for-android_GM479516143.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/roblox-hacked-version_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/httpswwwurcouponsdealcom202103coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/coin-master-hack-spins-android_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/coin-master-daily-gifts_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/free-vpn-for-minecraft_GM479516143.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/coin-master-hack-tool-exe_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/rbx-claim_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/earn-robux_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/free-robux-accounts_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/roblox-free-play-no-download_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/20-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050e7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50E7 26392 bytes
SHA-256: 4e5d23b0c11a4cc22ebdd5256de1ec956632bdbcb52ebd14deec551efd51f9d0
font_01_sfnt_off00008cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CAD 18244 bytes
SHA-256: 032754c85be32afc54ce42ff57082bfda3d842c531a4409870c690b3212eb60e

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