Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa3454eb37794b6…

MALICIOUS

PDF

225.9 KB Created: 2021-07-06 06:21:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0dc8486fb8393f6165f0de45220e2a86 SHA-1: 603a10d57909b283aace7b8c0e3d1bd68f68f9ae SHA-256: 5fa3454eb37794b62a3f8cb5d365a129d68203cf1af31e8127b7b9ee1dc9181b
250 Risk Score

Malware Insights

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

The PDF document contains multiple heuristics indicating social engineering lures, including a fake CAPTCHA, a game hack generator, and a browser extension installation prompt. The primary embedded URL, http://netcdn.tw/app/1094591345/pokemon-go-free-coins-hack-game-hack, is flagged as a malicious redirector, suggesting it leads to a malicious payload or phishing site. The document's content and linked URL strongly suggest an attempt to trick the user into executing malicious code or visiting a compromised site.

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-coins-hack-game-hack In PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-robux-just-click_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/win-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/roblox-powering-imagination-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/wurst-download_GM479516143.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-hack-fast_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-hack-no-survey-or-verification_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/hack-killerboyjuan123-in-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/hack-roblox-da-hood-pc_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/minecraft-jar-free_GM479516143.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/roblox-free-games-only_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-roblox-clothes-for-your-avatar_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/redeem-robux-card-free_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-coin-master-cards-link_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/robux-free-c_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-roblox-accounts-with-password-and-username-for-free_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/descragr-hack-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-hack-apk_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_023_off00031cb0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31CB0 25576 bytes
SHA-256: d21b8a5d4b0295e7558f2ebda70ca4c2b16caa71897ed35e9eabb089fb55b78d
font_01_sfnt_off000358a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x358A7 18476 bytes
SHA-256: fc0498685c2b7a039b69ec8bd7d1ec1c5bf6c4adf6e3e90f14067ecbd4c0a967

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