Malicious PDF — malware analysis report

Static analysis result for SHA-256 3746a367e0af705d…

MALICIOUS

PDF

33.5 KB Created: 2021-07-24 08:19:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d579e6eb49dfb87ebdd655df9c571f7d SHA-1: d52e0f404ef85e07e83a6c62e698e2b6ecf0e78b SHA-256: 3746a367e0af705d30d7310ba587da5ef5e2b20729a8cd78d4d084478b6d51f2
82 Risk Score

Malware Insights

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

The PDF document contains multiple links to external websites, including one specifically advertising a 'free generator / game hack'. This suggests a lure to trick users into visiting a site that likely hosts malware or phishing content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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/free-spins-from-coin-master-game-hack PDF link annotation
    • http://stsbih.com.ba/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://stsbih.com.ba/images/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://stsbih.com.ba/images/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • http://stsbih.com.ba/images/free-robux-script_GM431946152.pdfIn PDF document text
    • http://stsbih.com.ba/images/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://stsbih.com.ba/images/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://stsbih.com.ba/images/free-tiktok-likes-generator_GM835599320.pdfIn PDF document text
    • http://stsbih.com.ba/images/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://stsbih.com.ba/images/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://stsbih.com.ba/images/free-tiktok-followers-no-human-verification-or-survey-2021_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_off00002cd1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2CD1 23324 bytes
SHA-256: a1eba11b73d64f49683694c1fa8d49c8bd3998b81fddaa120f85679f2eb54d03
font_01_sfnt_off00006179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6179 18148 bytes
SHA-256: a8179ab01d9f651dd6fb5ce3364ead5561884d8b40fe8a62eaf26fde05d0c646

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