Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f63dc1f4c1cbfe4…

MALICIOUS

PDF

43.5 KB Created: 2021-06-11 05:30:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e11e0463297df0576d110b277a752fa8 SHA-1: 53cf1619fab5a9d46a34184f5b55b6895a9f8c49 SHA-256: 1f63dc1f4c1cbfe46df0302602765f0d4ca120bfe156ba3b6c0134468432d137
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a fake CAPTCHA lure and a call-to-action to download a file, strongly suggesting a social engineering attack. The embedded URL and numerous other URLs point to sites offering 'free Robux' or 'hacks', indicating a phishing or scam attempt. The ML classifier also flagged this PDF as malicious with high confidence.

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/roblox-account-free-robux-game-hack PDF link annotation
    • http://www.marambio.com.ar/images/free-exploit-roblox-auto-updating_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/offer-for-pubg-uc_GM1330123889.pdfIn PDF document text
    • http://www.marambio.com.ar/images/contact-roblox-account-hacked_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.marambio.com.ar/images/free-robux-valid-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/royalty-free-roblox-music_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/strawberry-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/easy-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/free-roblox-account-with-obc-lifetime_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/how-to-get-free-things-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/free-foxy-food-coin-master_GM406889139.pdfIn PDF document text
    • http://www.marambio.com.ar/images/free-roblox-accounts-with-builders-club_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.marambio.com.ar/images/minecraft-bedrock-edition-pc-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 7

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_off00004f7a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F7A 24520 bytes
SHA-256: 0d9d122039455c145f42d797e1bec1a995727fe279fd4b88e11376c2e861f407
font_01_sfnt_off000087ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87AC 18192 bytes
SHA-256: efb52f63c68a5277bef3f3b5a47277cfcf38672b05114182e6372d06dc0958cf

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