Malicious PDF — malware analysis report

Static analysis result for SHA-256 a043ea0053127c0b…

MALICIOUS

PDF

48.0 KB Created: 2021-06-08 12:52:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 73f419067beb6a3a78c28edb0ca8babc SHA-1: c31792fd91239f9a1e2b37a639ee0351550657e4 SHA-256: a043ea0053127c0bfc4c546e3830629ee53549282fe6887c6014dc8901018f6d
142 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA and a lure for free game currency, aiming to trick the user into clicking a malicious link. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple URLs associated with game-related scams supports this assessment. No scripts were extracted, but the document's structure and embedded URLs indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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-roblox-game-card-codes-game-hack PDF link annotation
    • https://reggieslockandkey.com/images/minecraft-free-app_GM479516143.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-tiktok-followers-generator_GM835599320.pdfIn PDF document text
    • http://reggieslockandkey.com/images/oprewards-robux_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/robux-sites_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/coin-master-free-spins-fb_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/earn-rbx_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/coin-master-apk-hack-32_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/wahoogaming-co-free-robux_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/minecraft-windows-10-edition-free-download_GM479516143.pdfIn PDF document text
    • https://reggieslockandkey.com/images/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/how-to-become-builders-club-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/paytm-to-pubg-uc_GM1330123889.pdfIn PDF document text
    • https://www.micIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000503e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x503E 25852 bytes
SHA-256: 5adc20f862c080384f64452173897cb2a2b16dec71f32961051ba27e23ca595c
font_01_sfnt_off00008b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B4C 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off000097f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97F4 18612 bytes
SHA-256: 56016ac889c0035d237d735fa46ec41b1f854efd063683e8c1ef365eb7e06e66

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