Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb78942021db523…

MALICIOUS

PDF

35.2 KB Created: 2021-07-05 17:44:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c7494050b348613cf42e05b26f383e6f SHA-1: 3927d414e3ffddfbb8aa5538884937206645e935 SHA-256: 5eb78942021db523946ae24b4dacfddb7aa3a49ac580ac8f54309712b5582f40
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector domains, including one identified as malicious infrastructure, which are disguised as "free generator" or "game hack" lures. The presence of these links and the ML classifier's high confidence score indicate a high likelihood of this document being used to redirect users to malicious sites. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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-free-followers-without-human-verification-game-hack In PDF document text
    • http://perpus.i2s-learning.com/repository/minecraft-18-9-hacked-client_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-roblox-injector_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-daily-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/earth-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-tower-battles-hack-script-2021_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/energize-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/como-poner-hacks-en-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/roblox-avatar-editor-free_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-hack-in-the-grand-crossing-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-get-free-clothes-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/my-minecraft-account-was-hacked_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-games-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-get-free-stuff-on-roblox-2021-mobile_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/oprewards-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/hack-hoogon123-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/rthro-roblox-free_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000031b5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31B5 22752 bytes
SHA-256: ab8254d35102dcf504fcdd7a229e085b29a5bfa96a5b9d6736101a5ce3fc7938
font_01_sfnt_off000064b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64B7 19108 bytes
SHA-256: 84f68571c8b0b5ae9f2b1681386afab69cab4bcb8b53bf62bc479640cd228623

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