Malicious PDF — malware analysis report

Static analysis result for SHA-256 de2933773ec86869…

MALICIOUS

PDF

46.5 KB Created: 2021-06-03 12:57:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 53aa1de312ae5ef679d89d2990ad4b5a SHA-1: 8a0f7caaa189e02a47d0cd948093a9e71d221080 SHA-256: de2933773ec8686982e3e9ac95d2271be55c7b8784a57857f4dcdd588177ecc6
200 Risk Score

Malware Insights

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

The PDF document presents a fake CAPTCHA to trick users into clicking a link, which leads to a malicious redirector. The primary link directs to 'https://netcdn.online/app/431946152/i-need-robux-game-hack', a known malicious domain associated with game hack lures. The document's structure and embedded links suggest an attempt to exploit user interest in free game items or cheats to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 5

  • 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
  • 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 https://netcdn.online/app/431946152/i-need-robux-game-hack In PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coinmasterhack-club_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/haktuts-coin-master-today_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-minecraft-games-for-kids_GM479516143.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-hack-ios-12_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/impact-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/roblox-hack-app_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-spin-and-win-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/robloxfun-com-generator_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/jailbreak-script_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-mod-apk-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-fan-page_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_004_off0000511d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x511D 30340 bytes
SHA-256: 5856f546f80e85c2e1e58f2a9f5dcdf8143b800f41781c8a5e546c096d19132a
font_01_sfnt_off00009409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9409 18024 bytes
SHA-256: f1ec7b04fe7efc10da220c54b18b8286c95b0450e2bf9e35db279b0a74518d0c

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