Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4fa3736d2d3f064…

MALICIOUS

PDF

31.4 KB Created: 2021-07-21 05:40:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 43728917e37e57fb43feaadcc9c1360e SHA-1: 44c777411b93c862e561591673e69cfb0024b88f SHA-256: a4fa3736d2d3f0648bc5c56987d385f7b05bbd26f74b079f49653da2efb6f489
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a 'free generator / game hack' which redirects to the malicious URL http://netcdn.tw/app/835599320/tiktok-likes-for-free-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or scam attempt designed to trick users into visiting a malicious site. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 4

  • 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/835599320/tiktok-likes-for-free-game-hack PDF link annotation
    • https://www.optom.co.nz/images/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • https://www.optom.co.nz/images/free-minecraft-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • https://www.optom.co.nz/images/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • https://www.optom.co.nz/images/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://www.optom.co.nz/images/free-robux-today_GM431946152.pdfIn PDF document text
    • https://www.optom.co.nz/images/minecraft-pe-free_GM479516143.pdfIn PDF document text
    • https://www.optom.co.nz/images/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • https://www.optom.co.nz/images/minecraft-account-hacked_GM479516143.pdfIn PDF document text
    • https://www.optom.co.nz/images/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.optom.co.nz/images/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • http://www.tiktok.com/fypIn 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_off00002ab1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2AB1 21988 bytes
SHA-256: 2abb418f5cebf202c66f92660da70ee85f8a2a6fce109ba38f6ee278b080c10c
font_01_sfnt_off00005b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B20 17456 bytes
SHA-256: 6bc07a916d4e04dd857b15fc22f6a85a1633f574b63a4730ea8dc15634c660b5

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