Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40b7e862d265f3a…

MALICIOUS

PDF

49.0 KB Created: 2021-06-13 17:15:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 10ea442e795def9a219a1a925763bb4d SHA-1: 2f68b3257e2a4be6fd95481bc0e72878b1896d9a SHA-256: a40b7e862d265f3ac2a44fff87c55a7cb359ae704055fedf5ddb0e6c27063538
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document contains multiple links designed to lure users into clicking on 'free generator' or 'game hack' content, impersonating brands like Facebook. The primary link, http://netcdn.co/app/431946152/how-can-i-get-free-robux-in-roblox-game-hack, suggests a credential phishing or malware download attempt. No scripts were extracted, but the document structure and heuristics strongly indicate a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.
  • 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.co/app/431946152/how-can-i-get-free-robux-in-roblox-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.co/app/431946152/how-can-i-get-free-robux-in-roblox-game-hack PDF link annotation
    • http://digilib-ppsunisma.ac.id/repository/roblox-skywars-mega-vip-free_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/roblox-online-free-play-now_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-roblox-zombie-games_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/bleu-roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/how-to-get-free-robux-no-generator-2021_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/inappropriate-roblox-games_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-robux-list_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/roblox-noclip-free_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/how-to-play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/coin-master-free-spins--spins_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/coin-master-hack-mod-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/roblox-diamond-hack_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/coin-master-facebook-page_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/is-minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/minecraft-com-free_GM479516143.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/cheat-codes-for-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_off00005113.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5113 28384 bytes
SHA-256: 71a528825c31ca7aab8fd413723203a363a09a68a9027a517eb866eb91d6306f
font_01_sfnt_off00009243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9243 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00009bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BF1 18584 bytes
SHA-256: 8947ab4283e7e4bb40f6e27a2626c9b4c3bb63a97c0f3668a155d3fd27871a54

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