Malicious PDF — malware analysis report

Static analysis result for SHA-256 1825196010ad54b3…

MALICIOUS

PDF

50.9 KB Created: 2021-06-10 21:19:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b2d96729cff2f2ae055fe6f6d8878086 SHA-1: 5fd9f22d4121e293245d79da26b02306e3c17f8f SHA-256: 1825196010ad54b3f9db6d993d6fbcbe03af6547457493574ed1da4677998f78
200 Risk Score

Malware Insights

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

The PDF document employs social engineering tactics, presenting a fake CAPTCHA and a download button to lure the user into clicking a link. This link, 'https://netcdn.tw/app/431946152/free-robux-click-here-game-hack', redirects to known malicious infrastructure, indicating an attempt to deliver a payload or lead the user to a phishing site. The document's content and heuristics strongly suggest a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9724

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.tw/app/431946152/free-robux-click-here-game-hack In PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/offers-to-complete-and-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/minecraft-bedrock-edition-free-with-java_GM479516143.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/how-to-get-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/roblox-hacked-version-download_GM431946152.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/como-hackear-roblox-2021_GM431946152.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/free-robux-obby-2021_GM431946152.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/free-shields-coin-master_GM406889139.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/hack-coin-master-spin-android_GM406889139.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/free-account-roblox-2021_GM431946152.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/minecraft-java-edition-key-free_GM479516143.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/mosttechs-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/tiktok-free-hearts-apk_GM835599320.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/free-robux-safe_GM431946152.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/minecraft-pocket-edition-apk-free-download_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000057cb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x57CB 27696 bytes
SHA-256: 73ce8b61e1d9400d8ca1f2161bdd853231ab59602e4b6878810a5902b37f665e
font_01_sfnt_off00009766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9766 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off0000a477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA477 18380 bytes
SHA-256: fce1fe8f4cd3188815e2c4ff725c4a79edcf8fa0e8895c911f0dfe42aee83bd0

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