Malicious PDF — malware analysis report

Static analysis result for SHA-256 1deb55b2097f901d…

MALICIOUS

PDF

44.2 KB Created: 2021-06-10 20:19:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 025b7c176c7362d01e84f1cdcc4c3ee8 SHA-1: c502be7ed4b3f33c898c0a0190e9c0845cd8de5e SHA-256: 1deb55b2097f901d88b1db0270dca402f01ad7251c96925ac98450a05a4cf1ca
200 Risk Score

Malware Insights

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

The PDF contains multiple embedded links that redirect to a malicious domain, masquerading as a 'free Robux generator' or 'game hack'. The document body and heuristics indicate a fake CAPTCHA and download button lure, designed to trick users into clicking the malicious link. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/robux-free-no-human-verification-pc-game-hack In PDF document text
    • https://library.sman1berau.sch.id/repository/free-roblox-followers-generator_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-spin-link-coin-master-app_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-moonactive_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-executor-roblox_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-girl-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-unlimited-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-download-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-pet-food-for-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-that-really_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-free-download-pc_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-link-deutsch-ios_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-unlimited-spin-apk-free-download_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-rewards-site_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-hack_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-bedrock-edition-pc-free_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
font_00_sfnt_off00004ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FFA 24560 bytes
SHA-256: ce237d2e2b0757c7ba71523f2176b11f3ba8b88a4dca1fb023a0159d2b83c664
font_01_sfnt_off0000881b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x881B 19012 bytes
SHA-256: b4b5ba58551549c6c230b0b23283f76a8fd82ecd3e5cf56e223fa6a91fa039dd

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