Malicious PDF — malware analysis report

Static analysis result for SHA-256 055bc6bf1406c326…

MALICIOUS

PDF

44.1 KB Created: 2021-05-12 14:39:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 56fc5cd1791ee079b594cf883c0bc402 SHA-1: 1cb8de7e4ea1b72c039a1f283b418754e51d3f7d SHA-256: 055bc6bf1406c32678d9d049e212eb3a895e6dbb0bf11141dde300aba6e4bd0c
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs that lead to websites offering 'free generators' or 'game hacks', a common lure for phishing or malware distribution. The ML classifier strongly indicated maliciousness, and the document body, though partially corrupted, contains references to these lures and external URLs. No scripts were extracted, but the presence of external links suggests a redirection to a malicious site or a download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://netcdn.xyz/app/479516143/how-to-get-minecraft-windows-10-for-free-with-java-game-hack PDF link annotation
    • http://osteonad.com/images/free-robux-master_GM431946152.pdfIn PDF document text
    • http://osteonad.com/images/coin-master-free-spins-and-coins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://osteonad.com/images/hacks-for-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://osteonad.com/images/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • http://osteonad.com/images/20-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://osteonad.com/images/levvvel-coin-master_GM406889139.pdfIn PDF document text
    • http://osteonad.com/images/free-coin-master-spins-2021-link_GM406889139.pdfIn PDF document text
    • http://osteonad.com/images/spin-rewards-coin-master_GM406889139.pdfIn PDF document text
    • http://osteonad.com/images/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://osteonad.com/images/latest-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://osteonad.com/images/coin-master-free-spins-link-may-2021_GM406889139.pdfIn PDF document text
    • http://osteonad.com/images/how-to-hack-coin-master-with-game-guardian_GM406889139.pdfIn PDF document text
    • http://osteonad.com/images/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://osteonad.com/images/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • http://osteonad.com/images/roblox-skins-boy-free_GM431946152.pdfIn PDF document text
    • http://osteonad.com/images/free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://osteonad.com/images/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://osteonad.com/images/make-free-robux_GM431946152.pdfIn PDF document text
    • http://osteonad.com/images/can-i-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://osteonad.com/images/robux-online_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_003_off00004e77.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E77 25108 bytes
SHA-256: e4d5927acd3157c98ad92010dec9ba9d8e9a2f43dd14d269122f2c20fd7e677e
font_01_sfnt_off00008800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8800 18972 bytes
SHA-256: 8e658ed9ffe7233ae998901bc6eec399b36e43f77efcaafe704fa409c54d4733

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