Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51c20fd1671a25c…

MALICIOUS

PDF

32.7 KB Created: 2021-07-19 14:50:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8ba956b2e505c8f515ba86cbc7ff1895 SHA-1: 848ac0e170a67f318df62667a5f60700ffc2158e SHA-256: c51c20fd1671a25caa506cc81694e6e7c7cbf388cc2b898086d18cce3c3c77a0
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 0.9900

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/earn-free-robux-game-hack PDF link annotation
    • http://www.backlineservice.nl/images/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://www.backlineservice.nl/images/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://www.backlineservice.nl/images/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.backlineservice.nl/images/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.backlineservice.nl/images/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://www.backlineservice.nl/images/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://www.backlineservice.nl/images/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.backlineservice.nl/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.backlineservice.nl/images/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://www.backlineservice.nl/images/free-minecraft-account-generator_GM479516143.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
font_00_sfnt_off00002af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AF8 22500 bytes
SHA-256: 0dd9cdce60f95ffe343e7aeaf5ce3e4c4badc76f4c25bcef93ae2d9f3c75dfaa
font_01_sfnt_off00005d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D47 18428 bytes
SHA-256: ce8be1eae563149e41a2b7e5f13780d458aa554a2c2a18751dc5d40709868ea0

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