Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5cb15e24d4e1ef…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 11:40:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 55a0988a3ecd19505d6d9686bc623a20 SHA-1: cbf654cf39f7e6677478279c7395d50c3e9d6133 SHA-256: 8e5cb15e24d4e1ef558b64da5e833cc86ec74a6c753c5976e6e27acd7eeea15a
182 Risk Score

Malware Insights

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

This PDF document is designed as a lure, impersonating brands like Facebook and promising free game currency or hacks for popular games like Roblox and Coin Master. It contains numerous links to external sites, including 'http://netcdn.tw/app/431946152/roblox-army-free-robux-game-hack', which likely host credential phishing forms or download further malicious content. The PDF_SEO_LINK_FARM heuristic indicates a large number of such links were generated, suggesting a broad campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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: http://netcdn.tw/app/431946152/roblox-army-free-robux-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 http://netcdn.tw/app/431946152/roblox-army-free-robux-game-hack PDF link annotation
    • http://digilib.unbari.ac.id/repository/easy-robux-today-com_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-spins-and-coins-com_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-mod-apk-2021_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-free-builders-club-hack_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-hack-cheat-engine_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-spins-coin-master-april-2021_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-get-free-tix-on-roblox-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/assassin-item-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-hack-ios-app_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-daily-free-spins-link-today-2021-free_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-hack-into-a-roblox-private-game_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/best-way-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-com-free_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/como-hackear-juegos-de-roblox_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
font_00_sfnt_off00002f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F73 22332 bytes
SHA-256: 6e72639e37d752802ba6d8192d343a2d394c4c73cd1a9f43c76fcadbc2d897d6
font_01_sfnt_off0000613e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x613E 19228 bytes
SHA-256: 5339edd26a46d5c8fe04f627c79d78710f89e028f0bde03da11f3fdfc149047d

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