Malicious PDF — malware analysis report

Static analysis result for SHA-256 340785dec4b86649…

MALICIOUS

PDF

50.6 KB Created: 2021-06-03 14:59:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 33b971e7570953789ebca84c8c3d6f28 SHA-1: 1edfd8751b1f7ca0f584f6631f81ae8d775f584d SHA-256: 340785dec4b86649edb6ab8e837f49b651f1bbbcdba6063901d74ab6a596d472
122 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 clicking links that lead to malicious websites, likely for downloading malware or further phishing. The document body and extracted URLs indicate a focus on game hacks and cheats, such as 'Robux Converter' and 'Coin Master' related content. While no scripts were directly extracted, the PDF's nature and the presence of external links suggest a potential for exploiting vulnerabilities or delivering a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9779

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/robux-converter-game-hack PDF link annotation
    • http://librarysenior.com/repository/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-cards_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/free-admin-roblox_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/minecraft-java-edition-free-download-for-android_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-hack-apk-35-18_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/best-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-free-coin-and-spin-app_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-free-coins-link-facebook_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-on-facebook_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-mod-version-free-download-34-4_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/1x1x1x1-roblox-id_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-spin-link_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/hack-coin-pro-coin-master_GM406889139.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_off00005310.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5310 30280 bytes
SHA-256: 59222a654fc7d52044cacb106acc20e49c2a2b14d4f71997966541d99f65a9b1
font_01_sfnt_off000098ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98AD 3120 bytes
SHA-256: 49734f51977507cba6bc8d3ad0cee0363aa119856db094427deb9cf565bb7bca
font_02_sfnt_off0000a3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA3C1 18068 bytes
SHA-256: 445b05a7d025cae97bc3d237a95317cdc5e9af3154d94cfe5f369ebdcdfa036d

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