Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea3fd185428ceae3…

MALICIOUS

PDF

45.2 KB Created: 2021-05-10 20:31:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 40584680c6d5fccc3040325a65242fa2 SHA-1: aad6b465e7ed13df8fe11ddef7ba5b1d8c53be32 SHA-256: ea3fd185428ceae3b8a79e7767faa55a2ab9d0990793d729faffcfa9d6997f27
200 Risk Score

Malware Insights

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

The PDF document employs a fake CAPTCHA lure to trick users into interacting with a link. This link redirects to malicious infrastructure, specifically a site offering 'free robux games' and 'game hacks', which is a common social engineering tactic. The ML classifier strongly supports the malicious nature of this PDF, and the embedded URLs indicate a clear intent to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.xyz/app/431946152/free-robux-games-game-hack In PDF document text
    • https://elearning-mtsn3jkt.com/__statics/gudangsoal/files/coin-master-haktuts_GM406889139.pdfIn PDF document text
    • https://elearning-mtsn3jkt.com/__statics/gudangsoal/files/coin-master-hack-cheat-generator-d_GM406889139.pdfIn PDF document text
    • https://elearning-mtsn3jkt.com/__statics/gudangsoal/files/free-coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • https://elearning-mtsn3jkt.com/__statics/gudangsoal/files/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • https://elearning-mtsn3jkt.com/__statics/gudangsoal/files/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning-mtsn3jkt.com/__statics/gudangsoal/files/coin-master-spin-link_GM406889139.pdfIn PDF document text
    • https://elearning-mtsn3jkt.com/__statics/gudangsoal/files/coin-master-card-collection-link_GM406889139.pdfIn PDF document text
    • https://elearning-mtsn3jkt.com/__statics/gudangsoal/files/coin-master-free-spins-link-today-ios_GM406889139.pdfIn PDF document text
    • https://elearning-mtsn3jkt.com/__statics/gudangsoal/files/free-minecraft-windows-10-with-java_GM479516143.pdfIn PDF document text
    • https://elearning-mtsn3jkt.com/__statics/gudangsoal/files/free-coins-app-for-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning-mtsn3jkt.com/__statics/gudangsoal/files/free-robux-live_GM431946152.pdfIn PDF document text
    • https://elearning-mtsn3jkt.com/__statics/gudangsoal/files/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • https://elearning-mtsn3jkt.com/__statics/gudangsoal/files/coin-master-hack-generator-tool_GM406889139.pdfIn PDF document text
    • https://elearning-mtsn3jkt.com/__statics/gudangsoal/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://elearning-mtsn3jkt.com/__statics/gudangsoal/files/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • https://elearning-mtsn3jkt.com/__statics/gudangsoal/files/coin-spin_GM406889139.pdfIn PDF document text
    • https://elearning-mtsn3jkt.com/__statics/gudangsoal/files/coin-master-free-daily-rewards_GM406889139.pdfIn PDF document text
    • https://elearning-mtsn3jkt.com/__statics/gudangsoal/files/levvvel-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning-mtsn3jkt.com/__statics/gudangsoal/files/new-free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning-mtsn3jkt.com/__statics/gudangsoal/files/roblox-avatar-maker-free_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_003_off00004ea4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EA4 26816 bytes
SHA-256: 5ef2b7ce40690454150f4363bea3b2cd6524b3722c1d2fa175fc99e7dd175219
font_01_sfnt_off00008ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DDC 18500 bytes
SHA-256: 50954281d46d1092d2c36c5fba9e04257001c8c7e5b0c8732206987489559ecb

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