Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43e435a90dde3c3…

MALICIOUS

PDF

46.8 KB Created: 2021-06-04 01:49:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3645e9eac46270852e2c6aee97537c34 SHA-1: a690b6b715c5b2711cc6bb0722ef9466ff05f081 SHA-256: f43e435a90dde3c3b389d81f35cffec5c9b954d547f9a010bbfc102214599ef3
82 Risk Score

Malware Insights

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

The sample is a PDF document that displays a fake CAPTCHA or human verification prompt to trick the user into interacting with it. It contains an embedded URI pointing to a URL associated with game hacks, and multiple other URLs hosted on similar domains, suggesting a phishing or malware distribution scheme. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/roblox-bux-free-game-hack PDF link annotation
    • http://perpus.polimarim.online/repository/roblox-games-with-free-vip-servers_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/coin-master-fan-page_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/coin-master-free-spins-link-facebook-page_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/coin-master-free-spin-and-coin-link-app_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/minecraft-education-edition-free-download_GM479516143.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/haktuts-coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/how-to-get-free-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/www-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/mcpe-com_GM479516143.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/robuxmatchcom-free-robux_GM431946152.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_off00005232.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5232 24552 bytes
SHA-256: efea86f95d52aefda70273bd144bcaaabcc533f6018d8ef0e4e754998edb9c52
font_01_sfnt_off00008b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B00 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off000094b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94B3 18088 bytes
SHA-256: b1a1c5aa5d70c9a0c9451475d1836048e8ca34dc29aa31eabf35c019fc4d80ab

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