Malicious PDF — malware analysis report

Static analysis result for SHA-256 edaf80bcd1e7f044…

MALICIOUS

PDF

47.2 KB Created: 2021-06-11 01:08:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d47521ed8b56d8bc101eda0dfdd530fd SHA-1: 72bed79d7f1a1e5a790cfab0b9d6afc834668369 SHA-256: edaf80bcd1e7f04474fd84ac4e8f53cd03c7a9f0612c2986953660d3db2cedbd
142 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are disguised as PDF files, and employs a fake CAPTCHA lure to trick users into clicking them. The primary link, 'https://netcdn.tw/app/431946152/free-robux-websites-no-human-verification-2021-game-hack', suggests a scam or malware distribution. While no scripts were extracted, the document's structure and embedded links strongly indicate a phishing or social engineering attack aimed at delivering a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 6

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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-robux-websites-no-human-verification-2021-game-hack PDF link annotation
    • https://reggieslockandkey.com/images/free-minecraft-server-maker_GM479516143.pdfIn PDF document text
    • http://reggieslockandkey.com/images/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • http://reggieslockandkey.com/images/how-to-get-free-coins-and-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-card-hack-apk_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-robux_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-back-accessories-roblox_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-tiktok-likes-app_GM835599320.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/how-to-change-your-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-robux-picture_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/links-to-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/coin-master-free-coins-generator_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/hack-coin-master-spin-android_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/tiradas-coin-master_GM406889139.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_off00005012.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5012 24252 bytes
SHA-256: ec82e2ceb11ef69b0326518c8026dda7cb0d78bf70c529a59b37d14937179b2b
font_01_sfnt_off00008811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8811 2844 bytes
SHA-256: baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a
font_02_sfnt_off000091d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91D3 19460 bytes
SHA-256: 3971e8d4b55f180afb8bc99f15e8d0a43b4a4e02d9c77d03821edd48c4637e59

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