Malicious PDF — malware analysis report

Static analysis result for SHA-256 24a3f3f0788f6af6…

MALICIOUS

PDF

35.5 KB Created: 2021-07-03 13:44:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a2d8ffb284a1eddfc7a33ffe3f543e55 SHA-1: 49fc445e14a4295c81e822ab678bcea4f26157d9 SHA-256: 24a3f3f0788f6af64c287afa87e102c8a7c0525ecb2ce7e426d552c914903384
142 Risk Score

Malware Insights

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

The PDF document employs a lure of free game items and accounts to entice users, as indicated by the document body and multiple heuristics. It contains a large number of external links, identified as a 'PDF link farm', suggesting a tactic to manipulate search engine results or redirect users to malicious sites. The primary URL http://netcdn.tw/app/431946152/free-roblox-accounts-with-robux-that-work-2021-game-hack is a key indicator of this malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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/free-roblox-accounts-with-robux-that-work-2021-game-hack PDF link annotation
    • http://lib.stiesultanagung.ac.id//repository/coin-master-unlimited-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/cheats-for-meep-city-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/avatar-roblox-game_GM431946152.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/how-to-get-free-robux-instructions_GM431946152.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/how-ro-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/774-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/coin-master-free-spins-daily-fb-champion_GM406889139.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/como-hackear-cuentas-de-roblox-facil_GM431946152.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/how-to-get-the-business-cat-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id//repository/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/como-volar-en-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/como-ser-hacker-en-roblox-sencillamente_GM431946152.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/roblox-free-dominus-hack_GM431946152.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/moonactive-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/22-500-robux-free_GM431946152.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id//repository/minecraft-apk-download-free-11-055_GM479516143.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/how-to-get-100-robux-on-roblox-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://lib.stiesultanagung.ac.id/repository/free-robux-one-app-rewards_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
stream_002_off0000304b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x304B 22652 bytes
SHA-256: 5c58db245c7671b53f421bb6441cb33a12f4ad3b52430e23f9ee2f209a9f52f1
font_01_sfnt_off0000630c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x630C 19948 bytes
SHA-256: 25c875579330c816dc270a6cc831986c277f5cf3e4bf50255e97f253356454b0

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