Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1658176c21e7ef4…

MALICIOUS

PDF

41.7 KB Created: 2021-05-16 12:20:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 69c8892d906153e8cb62dc90437eac0e SHA-1: b88863fc1db9e42095591ea21e315abdb3c477ca SHA-256: b1658176c21e7ef49be54b511ab6f804daa6864c37dbc2d50a3b5253cd7b0a0d
202 Risk Score

Malware Insights

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

The PDF document contains multiple lures related to game hacks and free generators, including a fake CAPTCHA prompt to trick users into interacting. It directs users to external URLs that are likely hosting malicious content or phishing pages. The document's primary purpose appears to be tricking users into clicking these links, potentially leading to malware downloads or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • 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.xyz/app/406889139/master-coin-hack-app-game-hack PDF link annotation
    • https://corbo.ru/images/coin-master-hack-xyz-download_GM406889139.pdfIn PDF document text
    • https://corbo.ru/images/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://corbo.ru/images/minecraft-free-exe_GM479516143.pdfIn PDF document text
    • https://corbo.ru/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • https://corbo.ru/images/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://corbo.ru/images/coin-master-mod_GM406889139.pdfIn PDF document text
    • https://corbo.ru/images/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • https://corbo.ru/images/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://corbo.ru/images/coin-master-daily-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
    • https://corbo.ru/images/free-spins-promo-code-for-coin-master_GM406889139.pdfIn PDF document text
    • https://corbo.ru/images/earn-robux_GM431946152.pdfIn PDF document text
    • https://corbo.ru/images/hackear-juego-coin-master-espaol_GM406889139.pdfIn PDF document text
    • https://corbo.ru/images/free-coins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • https://corbo.ru/images/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • https://corbo.ru/images/free-shirt-roblox_GM431946152.pdfIn PDF document text
    • https://corbo.ru/images/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • https://corbo.ru/images/free-roblox-accounts-generator_GM431946152.pdfIn PDF document text
    • https://corbo.ru/images/how-to-hack-coin-master-apple_GM406889139.pdfIn PDF document text
    • https://corbo.ru/images/https-iosgodscom-topic-20214coinmasterhack_GM406889139.pdfIn PDF document text
    • https://corbo.ru/images/how-to-earn-robux-for-free-2021_GM431946152.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_003_off00004981.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4981 24544 bytes
SHA-256: 0b51834ee8a636c6eea729791bfbb6e2944d36cc9b1d9abe30e9a88371bf471e
font_01_sfnt_off000081ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81BA 17892 bytes
SHA-256: 41282dcb1c000e988ea8b2199b00347d54e117e16c55148ab4165d720f01bc1d

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