Malicious PDF — malware analysis report

Static analysis result for SHA-256 a75aed0e5e3fc817…

MALICIOUS

PDF

227.0 KB Created: 2021-07-08 00:22:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2f7337f1c64968244af4caba7bb0357b SHA-1: 8b9b2afe6cc9850762705cb3d3fbcc27b0698390 SHA-256: a75aed0e5e3fc8176ca8d7b691cee9a08aa3c6340c2c9480a6753c9b7b20d09a
250 Risk Score

Malware Insights

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

The PDF document contains multiple lures designed to trick users into clicking malicious links. Heuristics indicate the presence of fake CAPTCHA prompts, browser update lures, and payment redirection schemes, all pointing towards a scam or phishing attempt. The primary malicious URL identified is http://netcdn.tw/app/1094591345/pokemon-go-free-7km-eggs-august-2021-game-hack, which is associated with known malicious redirector infrastructure.

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-7km-eggs-august-2021-game-hack In PDF document text
    • http://opac.stiesa.ac.id/repository/roblox-but_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-hack-here_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/get-me-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-free-spins-link-today-ios_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/hacker-para-roblox-2021_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/minecraft-windows-10-edition-free-with-java_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-free-spins-android_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-hack-fast_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/claim-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/cute-free-roblox-clothes_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-roblox-hack_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_off00031eeb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31EEB 25576 bytes
SHA-256: 08c148c15a188e459252503dcc92f287c5e3a5c4a41128b8a0775632f90e4b99
font_01_sfnt_off00035aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35AEF 19060 bytes
SHA-256: 0c0cc117c1dc3dc4e0dac5cd0c94423befda0e1f16e80a93755075d179263fca

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