Malicious PDF — malware analysis report

Static analysis result for SHA-256 c393bfe3ef47abf3…

MALICIOUS

PDF

33.8 KB Created: 2021-07-19 21:10:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1627e81433aacffd9a6bcb4808e24216 SHA-1: aa2ff9db2504e6d62c8f5e554f5e744dc144879a SHA-256: c393bfe3ef47abf33182862816999923ab5a7795c03fd58ddf59e3d261f2eef9
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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/406889139/how-to-get-free-coins-on-coin-master-game-hack PDF link annotation
    • http://muko-unterfranken.info/images/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • http://muko-unterfranken.info/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://muko-unterfranken.info/images/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://muko-unterfranken.info/images/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://muko-unterfranken.info/images/free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://muko-unterfranken.info/images/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://muko-unterfranken.info/images/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://muko-unterfranken.info/images/how-to-get-minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • http://muko-unterfranken.info/images/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • http://muko-unterfranken.info/images/free-likes-on-tiktok_GM835599320.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_002_off00002ed2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2ED2 23404 bytes
SHA-256: b3ccb461e054baa4b29f9fe2833d80f0be7c7132b7cfe688f26b4834f20509cc
font_01_sfnt_off00006381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6381 17872 bytes
SHA-256: 51f02da227d0679d4a4cca1b372203100e5a9ff6587b3c267ccf786d3222cbcf

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