Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13a5a5f83c19b60…

MALICIOUS

PDF

44.5 KB Created: 2021-06-04 01:23:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d916e9b1d3b1c74df639a2fc9fc63952 SHA-1: d5b7a72bbec067891691d8242eb2630025925ffd SHA-256: e13a5a5f83c19b60fc7b091e47a5c2369b7d1d3c930138774e42d237653fa3ad
82 Risk Score

Malware Insights

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

The PDF document contains a high-severity heuristic firing for a "GAME_HACK_REDIRECT_LURE" pointing to a suspicious URL. The document body, though heavily obfuscated, contains text related to 'free coin spin' and a generator hack, reinforcing the lure. The ML classifier also flagged this PDF as malicious with high confidence. The primary IOC is the malicious redirect URL used in the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9804

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.online/app/406889139/free-coin-spin-game-hack PDF link annotation
    • http://opac.stieimalang.ac.id/repository/fb-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/free-coins-for-flip-master-online_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/http-bitly-coin-master-free-2021-spins_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/www-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/minecraft-free-download-linux_GM479516143.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/minecraft-hack-client-18-9_GM479516143.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/free-bling-bling-card-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/free-minecraft-realms-to-join_GM479516143.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/free-college-textbooks-tiktok_GM835599320.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/free-robux-safe_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004cd6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CD6 24052 bytes
SHA-256: 2d26e22dc5bc1a47e6973e6cffe15159452985f89b93f5014ef34a20e57a9a19
font_01_sfnt_off00008386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8386 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off00008d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D39 17552 bytes
SHA-256: f6733490f9e98ac1c6d381232fcc744520aff3fd481443809f2500373f365ecc

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