Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c638624dc6e7fb…

MALICIOUS

PDF

32.7 KB Created: 2021-07-04 22:17:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a478c31e7ab78dc80bd336f5877b19fa SHA-1: 465e9d88af599c5fbd26acdf32c67805778b0fe5 SHA-256: 90c638624dc6e7fb851194022e7687faa7374a3398f1c82f01cc5daccaa28b3f
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a prominent link to 'http://netcdn.tw/app/431946152/blox-land-free-robux-game-hack', presented as a lure for free game currency or hacks. This heuristic, combined with the ML classifier's high confidence, indicates a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/431946152/blox-land-free-robux-game-hack PDF link annotation
    • https://opac.heritagejkt.org/repository/coin-master-hack-ios-app_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/free-premium-roblox_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/roblox-rape_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/robux-hack-2021-on-windows_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/how-to-change-your-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/fre-robux-on-pc_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/coin-master-heaven-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/how-to-run-roblox-hacks-on-school-pc_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/roblox-electric-state-darkrp-hack_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/how-to-hack-in-any-roblox-account_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-official-fan-page_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/how-to-make-a-modded-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/hacker-roblox-female_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/auto-keyboard-for-roblox-free_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-free-spins-5-10-2021_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/how-to-hack-on-roblox-assain_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/roblox-promo-code-hack-2021-pastebin_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/roblox-murder-mystery-free-hacks_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/free-admin-roblox_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
font_00_sfnt_off00002a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A58 22108 bytes
SHA-256: cc2ca7efab6bfdd4d1979b589775a8d434f6623245414efe6b326123a1602051
font_01_sfnt_off00005b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B17 18964 bytes
SHA-256: 3f12ef93e3f94e19068a8415642f40f3a4d95b4d38f37f1bdada02c05cec8b59

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