Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f726ecc7f97d55…

MALICIOUS

PDF

45.9 KB Created: 2021-06-03 11:38:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 7423a5ab7ca0ee489b6c08a648da1acb SHA-1: cfff006210acf968805648cc19f789fbe68ac3f8 SHA-256: 52f726ecc7f97d555c0ea54fe1e7a6f10aed7aaa58047e783bdd82d43f27ff0c
162 Risk Score

Malware Insights

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

This PDF document employs a lure related to game hacks and free currency, impersonating Facebook to trick users into clicking a malicious link. The link, 'https://netcdn.online/app/406889139/free-coin-coin-master-game-hack', leads to a credential phishing page. The document also contains embedded links to other potentially malicious PDFs hosted on 'library.sdkmaterdei.sch.id'. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.online/app/406889139/free-coin-coin-master-game-hack.
  • 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/406889139/free-coin-coin-master-game-hack PDF link annotation
    • http://library.sdkmaterdei.sch.id/repository/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/roblox-password-hacker_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/minecraft-account-hacked_GM479516143.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/minecraft-marketplace-free_GM479516143.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/free-robux-no-verification-no-survey_GM431946152.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_off00004f3f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F3F 24924 bytes
SHA-256: e0ec7dc5129e8c688019b2ad0af1a760e699c3dcdb76dec7d028e92d39b1b45a
font_01_sfnt_off000088c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88C0 2820 bytes
SHA-256: e5f6ec650849eefe6bc6a1649c2875ce35328d23e4196945bba66cc43e5a49d4
font_02_sfnt_off0000925e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x925E 17712 bytes
SHA-256: effefb876c7a76aa063811ff0160e46fb8a90dd5507c6c48ef6fa39823ab5c8c

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