Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5cfa4e1742e2c7…

MALICIOUS

PDF

226.7 KB Created: 2021-07-05 10:56:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2536f7e99cfb58aab59116836fabd96c SHA-1: 1e64d63c2145fb3b38f4614870ebc6911648b944 SHA-256: 8a5cfa4e1742e2c7b36c4d9b9ae83d541f5f43622706a06476cec1d72ea6cbce
250 Risk Score

Malware Insights

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

The PDF document contains multiple embedded links that redirect to known malicious infrastructure, specifically advertising game hacks and free generators. Heuristics indicate the presence of fake CAPTCHA prompts and browser extension installation lures, designed to trick users into interacting with these malicious links. The primary malicious link identified is http://netcdn.tw/app/1094591345/pokemon-go-free-play-game-hack.

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/pokemon-go-free-play-game-hack In PDF document text
    • http://www.arichuna.com/images/files/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://www.arichuna.com/images/files/free-robux_GM431946152.pdfIn PDF document text
    • http://www.arichuna.com/images/files/roblox-hacked-database_GM431946152.pdfIn PDF document text
    • http://www.arichuna.com/images/files/coin-master-tiradas-gratis-2021_GM406889139.pdfIn PDF document text
    • http://www.arichuna.com/images/files/coin-master-how-to-get-japan-sushi-card-free_GM406889139.pdfIn PDF document text
    • http://www.arichuna.com/images/files/online-coin-master-free-spin-app_GM406889139.pdfIn PDF document text
    • http://www.arichuna.com/images/files/is-free-robux-real_GM431946152.pdfIn PDF document text
    • http://www.arichuna.com/images/files/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://www.arichuna.com/images/files/free-red-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://www.arichuna.com/images/files/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://www.arichuna.com/images/files/roblox-mad-paintball-2-hacks_GM431946152.pdfIn PDF document text
    • http://www.arichuna.com/images/files/new-roblox-logo-gives-free-robux_GM431946152.pdfIn PDF document text
    • http://www.arichuna.com/images/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.arichuna.com/images/files/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.arichuna.com/images/files/how-to-hack-death-run-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • http://www.arichuna.com/images/files/free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://www.arichuna.com/images/files/google-site-roblox-hack-get-free-robux-right-now-online_GM431946152.pdfIn PDF document text
    • http://www.arichuna.com/images/files/free-avatar-roblox_GM431946152.pdfIn PDF document text
    • http://www.arichuna.com/images/files/free-custom-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://www.arichuna.com/images/files/reddit-free-roblox-clothes_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_off00031f65.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31F65 25576 bytes
SHA-256: cca3cc3478fb5708ceaf317353106cb55fd306b4356e4e846c6ed45e8456b81a
font_01_sfnt_off00035b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35B70 18612 bytes
SHA-256: 21f71813ad1f0cc06aa5fb4caac6e7edca240eeb562630fff89edd8331d501f7

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