Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2fa01bf6defdc22…

MALICIOUS

PDF

44.0 KB Created: 2021-06-10 15:24:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a9a0dda86d14e96d4a16baed97e006c6 SHA-1: 64733e297b67809c85af9e7710180f28e973d980 SHA-256: b2fa01bf6defdc22eed71fbe781a86a9f5e83c23da765bd937521e11afa45d37
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA to trick the user into interacting with it, which is a common social engineering tactic. It contains multiple embedded URLs, one of which is directly linked to a heuristic firing for an external URI. The primary URL, https://netcdn.tw/app/431946152/free-id-roblox-game-hack, likely leads to a payload download. No scripts were extracted, but the presence of a fake CAPTCHA and external links suggests an attempt to exploit user interaction for malicious purposes.

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.tw/app/431946152/free-id-roblox-game-hack PDF link annotation
    • http://ims-77.fr/images/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://ims-77.fr/images/roblox-robux-hack-ios_GM431946152.pdfIn PDF document text
    • http://ims-77.fr/images/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://ims-77.fr/images/coin-master-daily-bonus_GM406889139.pdfIn PDF document text
    • http://ims-77.fr/images/robux-survey_GM431946152.pdfIn PDF document text
    • http://ims-77.fr/images/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://ims-77.fr/images/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • http://ims-77.fr/images/free-roblox-templates_GM431946152.pdfIn PDF document text
    • http://ims-77.fr/images/minecraft-pocket-edition-hack_GM479516143.pdfIn PDF document text
    • http://ims-77.fr/images/coin-master-cheats-free_GM406889139.pdfIn PDF document text
    • http://ims-77.fr/images/rbx-land-free-robux_GM431946152.pdfIn PDF document text
    • http://ims-77.fr/images/minecraft-pe-free-apk_GM479516143.pdfIn PDF document text
    • http://ims-77.fr/images/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://ims-77.fr/images/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdfIn PDF document text
    • http://ims-77.fr/images/roblox-avatar-tester_GM431946152.pdfIn PDF document text
    • http://ims-77.fr/images/coin-master-free-spins-link-2021-no-verification-deutsch_GM406889139.pdfIn PDF document text
    • http://ims-77.fr/images/coin-master-heaven-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://ims-77.fr/images/coin-master-free-coins-and-spins-link-today_GM406889139.pdfIn PDF document text
    • http://ims-77.fr/images/pokemon-go-free-coins-no-human-verification_GM1094591345.pdfIn PDF document text
    • http://ims-77.fr/images/free-spins-coin-master-hack-2021_GM406889139.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_off0000509f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x509F 24920 bytes
SHA-256: ab82e92ee33df1d3e65e1204de5fecc3039475ec2355295597d4f2ed4c143b05
font_01_sfnt_off000089cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89CF 18124 bytes
SHA-256: dabd6d3bcafeae11e01e38b7d597b2a0cdf0f853fab325470fbd0638e0d5c9ad

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