Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95f5320dbac9e2e…

MALICIOUS

PDF

227.3 KB Created: 2021-07-09 17:06:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 5c1e6b1251b3196ee920d8e8f823f917 SHA-1: 07fde2630c6949e39bebafbf6f0d9b194762c8d2 SHA-256: f95f5320dbac9e2ea2c7d6e113102a2ae9d31859688aad55b51b605929b24470
250 Risk Score

Malware Insights

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

The PDF document contains multiple heuristics indicating malicious intent, including a fake CAPTCHA, a lure for game hacks, and a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to game hacks and a URL that aligns with the heuristic findings. The primary lure appears to be a fake CAPTCHA and a promise of game hacks to trick the user into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier clean score 0.0118

Heuristics 7

  • 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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://netcdn.tw/app/1094591345/how-to-get-traded-pokemon-to-evolve-without-trading-game-hack In PDF document text
    • http://www.eucorro.com/arquivos/files/coin-master-cards-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/how-to-get-free-robux-legit_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/extreme-easy-free-robux_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/como-ser-hacker-en-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/roblox-arsenal-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/unlimited-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/ban-people-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/get-free-spins-link-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/roblox-hack-commands-list_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/coin-master-hack-progamers_GM406889139.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/hackeando-los-ordenadores-en-roblox-derank_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/free-robux-hack-generator_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_023_off00031f4c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31F4C 25576 bytes
SHA-256: c3f22d110a3757a90556370a452756a76bdacf18b696aef2cda07b633adc87ab
font_01_sfnt_off00035b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35B3A 19448 bytes
SHA-256: 5603af185cda0399a64c65650d67849dcbe975cf423fd26d72af5d8ce7f2c126

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