Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ca7c16a5aa5db7…

MALICIOUS

PDF

44.8 KB Created: 2021-06-11 04:18:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: cd11e5a4e610c6bb8d110ac94c32ae86 SHA-1: 736e6813bcb79e03ef17111163978816589a0b3d SHA-256: b5ca7c16a5aa5db7b8eb3577643ca1ec6f663bbf82b1a5454d5abfb452adf90b
240 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a fake CAPTCHA lure. The document body and embedded URLs suggest a social engineering attack aiming to trick users into clicking malicious links, potentially for credential harvesting or malware delivery. The primary malicious URL identified is https://netcdn.tw/app/431946152/how-to-hack-on-a-roblox-game-game-hack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 6

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/how-to-hack-on-a-roblox-game-game-hack.
  • 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
  • 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/how-to-hack-on-a-roblox-game-game-hack In PDF document text
    • http://www.taxiaparis.fr/images/how-to-get-free-pet-food-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.taxiaparis.fr/images/is-minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • http://www.taxiaparis.fr/images/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://www.taxiaparis.fr/images/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • http://www.taxiaparis.fr/images/minecraft-account-hacked_GM479516143.pdfIn PDF document text
    • http://www.taxiaparis.fr/images/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.taxiaparis.fr/images/free-robux-ad_GM431946152.pdfIn PDF document text
    • http://www.taxiaparis.fr/images/coin-master-free-in-app-purchases-jailbreak_GM406889139.pdfIn PDF document text
    • http://www.taxiaparis.fr/images/free-roblox-website_GM431946152.pdfIn PDF document text
    • http://www.taxiaparis.fr/images/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • http://www.taxiaparis.fr/images/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://www.taxiaparis.fr/images/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://www.taxiaparis.fr/images/coin-master-hack-tool-for-pc_GM406889139.pdfIn PDF document text
    • http://www.taxiaparis.fr/images/free-roblox-animations_GM431946152.pdfIn PDF document text
    • http://www.taxiaparis.fr/images/hack-coin-master-pc_GM406889139.pdfIn PDF document text
    • http://www.taxiaparis.fr/images/coin-master-heaven-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://www.taxiaparis.fr/images/big-booga-dig-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.taxiaparis.fr/images/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • http://www.taxiaparis.fr/images/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://www.taxiaparis.fr/images/60-free-spins-coin-master_GM406889139.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_004_off00004f79.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F79 26504 bytes
SHA-256: ea83ea4fab6ec64ab673d680a0cf6990f64f69a5f4e57ec1c0b7dde63466f94f
font_01_sfnt_off00008ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BA3 18608 bytes
SHA-256: 399df3bbaa814848c765c4d9fc7ca97b58adff3aebb0fdfbfbc775c17a360d08

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