Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b52108a4f238a1…

MALICIOUS

PDF

227.1 KB Created: 2021-07-05 22:41:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: c4876682f5911438091dbb949d44f5b8 SHA-1: d7c326eeb65b5693056430917fbbf70322b64fa8 SHA-256: d1b52108a4f238a1e95a8f52ad56da625d6c3f1643f6e10ec9979ab64d59c7e8
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 browser extension installation lure, and a payment redirection lure. The primary lure is a link to a 'free generator / game hack' which points to a known malicious redirector infrastructure. This suggests the document is designed to trick users into visiting malicious sites, potentially for credential theft or further malware delivery.

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-kanto-event-game-hack In PDF document text
    • https://pustaka.widyakartika.ac.id/repository/linkmon-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/roblox-browser-download-free_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/roblox-hacks-winrar_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-free-daily-spins-2021_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/pet-paradise-cheat-codes-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/script-hack-roblox-phantom-forces-2021_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-minecraft-java-server_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/restaurant-tycoon-roblox-cheats_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/roblox-free-xbox-packages_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-can-you-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-hack-peoples-passwords-on-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-get-hack-in-rake-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/minecraft-free-download-android_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-get-hacks-on-midieval-roblox-2021_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-hack-an-old-roblox-account_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/chad-the-beast-and-audrey-the-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-spins-coin-master-links-app_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-do-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-tiktok-followers-no-downloads_GM835599320.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/noob-vs-pro-vs-hacker-vs-god-minecraft_GM479516143.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_off0003210a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3210A 25576 bytes
SHA-256: 0b0697fbab9acc5618452841c23cfc5b454989bd2f63b3a167fe14b839a1df19
font_01_sfnt_off00035d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35D09 18576 bytes
SHA-256: 4a34cb6959f2a7b3fe8383c6f2078f1846c14402a27d36639a17ff3edf7168ae

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